I never claimed, that my theory is the right one. How could I ? 'm not in the head of the writers. I even said further down the thread, that  I'm not even sure, I'd like a solution along those lines.
But I do  see strong inconsistencies in the depiction of a character, who gets established as a leftie, and I don't believe, that we are looking at simple quirks or mistakes here. I think the leftie theme will get used for more than the psycho war between Sherlock and Jim. I personally COULD see a viable story line here; it all depends how the script handles it. BUT I could be totally wrong and I said so before.
Though I guess, that's not the point here. Everybody has different opinions, but I would never go as far as telling a poster: 'This is simply wrong'. Isn't that an insult as well? Because we can't know for sure. None of us has exclusive insights into the heads of the authors. This is a tv show, where everything is possible. We can only try to find things we consider as clues, try to piece them together and spin a tale. If the autors spin the same tale, we don't know yet.
We exchange ideas here. If I find a poster's thoughts too wild, so what? We are dealing with a wild invented story here. So I'd suggest: Let everybody live and present his or her ideas without attaching labels like right or wrong (except factual errors of course, like having remembered something the wrong way), because we simply can't know that.
At least for me, a forum, where we can't speculate, would be pretty boring after a while. After all, there's a long wait until 2013. And when we are presented with the solutions, I guess everyone of us will eat some big slices of crow cake.
I won't have much time over the weekend, but after that, I will start a thread with discarded ideas of mine, and the reasons, why I changed my mind. Maybe it would be fun, if some posters contribute some of their discarded ideas. Let's eat some humble pie!

I, for some reason throw a ball always with my right hand, even as a leftie. But I could not throw it with the other hand. I always do it with the right hand.
There are 'some people, who do some tasks with one hand and other tasks with the other hand. For example the Spanish tennis player Rafael Nadal does everything with his right hand EXCEPT playing tennis. This is called 'cross dominance'. But they always do it like this. Nadal could not play tennis with his right hand. There are very, very few people, who are true ambidexters, which means, they can perform every task with each hand, but that's very, very rare and not really an advantage, because in an emergency situation it's not good, if you have to decide first, which hand to use.

Well, I can snap fingers with both of my hands equally well, but, as a leftie I sure could not operate my phone solely with my right hand, or only very, very clumsily.
But for me it's striking, that the guy at the pool operates his phone solely with his left hand, while the guy at the Tower operates it solely with his right hand.
Since the huge majority of people have a hand preference, I don't think, it's just an actor's quirk, which went unnoticed.

What do I do, when I'm not sherlocking? (Could that be a new verb?) I write and work, I absolutely love music (classical music, especially opera, blues, jazz, rock) I paint, but most of all I read. I'm really a compulsive reader, and and my kindle in connection with all the classical literature at gutenberg.org is probably my best electronic friend. And I'm crazy about movies. Unfortunately my husband (who loves music, too) doesn't share that passion, but I'm perfectly capable of going alone to the movies, if something interests me, or watch dvd's alone. Actually it can be very relaxing at times. I can fully concentrate on the movie.My younger son shares my love for the movies, and it's wonderful to watch old movies with a young person. Having done competitive sport myself during my school and university days, I love to watch sports nowadays, especially tennis. But my family and my dog keep me more than active.
All that said, I have to confess, that sherlocking is really time consuming, so I had to cut down a bit with reading to gain the amount of free time. But I consider puzzling and writing about 'Sherlock' a creative exercise. It's time well spent - at least for a while, lol!

Irene, those screen grabs are great; and they show exactly the little hooked metallic object, I tried to describe all the time.I just can't understand, why so many people can't see it. In the first picture it kind of looks like a white or metallic tube. In the second picture it has turned a bit and you see the tiny hooked tip sitting on Sherlock's second smallest finger. It can't be a ray of light between fingers because his fingers and finger tips are closed and the object covers the finger just a bit. Also the bright area is too wide and too defined for it beeing just a ray of light .My husband says, it looks like a tiny metal utility tool, key tip , clasp... whatever. Anyway I found a video I'm going to post, where you can see this thing turn and glitter a bit, when the hands of Jim and Sherlock move.
But thanks for posting the grabs again. I'm not going to say anything more about it, because everybody can see and decide for himself. Also I don't have a really bright idea, what it is and if it's relevant at all; I'm just sure it's there.

Ahww, Sherlock, you have  many friends in the world wide web now. And you don't have to convert us, lol! We are here, because we are bitten by the Sherlock bug.
My husband watched SiP and Reichenbach with me. He really liked SiP; 'Reichenbach' we watched for analytical reasons, so we did not really relax. Have I converted him? Certainly not! He is  very disdainful of popular culture. A great mistake, as I realized again yesterday, when my foray into popular movie culture turned up yet another Rich Brooks nugget I will share with you guys tonight.

I will target my sisters and my best friends next. Being in Germany, it' a little difficult, since the Germad dvds aren't available yet, and not everyone of my friends is firm in English.

What MoGiss did with the Mycroft character, is one of the really nice and interesting things in the show. And as far as I know, it's a first. No other screen interpretation has done it before.
I wrote in the other thread about Sherlock's smoking habit, that I thought this scene in the morgue, when Mycroft offers him a cig to test Sherlock's will power, and then, when his will power turns out to be not in such a good shape, orders John to stay with Sherlock in a 'danger night', rather touching. Though Mycroft has just declared, that caring is not an advantage, he shows nevertheless how deeply he cares for his little brother. That's one of the reasons, that I don't believe for a moment, Mycroft doesn't know about Sherlock's faked death.His cool, but thoughtful reaction to the newspaper article shows, he must be in the know.

Here in Germany 'Sherlock' is also shown without commercial breaks, it's on public tv. So no time to develop some common sense during the show. It's left to us puzzle-obsessed fans to dissect everything with screen grabs and slo -mo, lol!

Thank you mOr1arty, as Davina said already, you rock! maybe you should give us 'linking lessons', lol!
Nice quote, you picked, by the way!

Wow, so Andy is a bit of a specialist in portraying twins! I overlooked that piece of information.
Personally, I feel, that strenghthens the twin theory. They might have picked Andy not only because he's a terrific actor but also  because of his 'twin prowess', lol!

Davina, I had EXactly the same thought about the pool scene: one goes, the other one pops out, lol,lol,lol!
Ok, Really good night, this is getting too hilarious!