I don't see why people are upset that Kakashi did Omote Renge. It was said in the series that to do that move it requires one to open up the first gate. I would expect most upper class shinobi to be able to at least open up the first gate, since all it really does is remove the limiters on the user's body. It was even shown when Kakashi was rock-climbing that he used the first gate.
And no offense, but anyone saying the sharingan can't copy taijutsu needs to rewatch the series. The entire basis of Sasuke's Shi Shi Rendan was on copying Rock Lee's movements from their ltitle spar, and later on in the Chuunin Exams Kakashi prepared him for Gaara by having him practice using Rock Lee's taijutsu and speed.
Lastly, although this is probably going to be dismissed by many, in the Naruto: Gekitou Ninja Taisen games, Sharingan Kakashi can use his counter move to copy Omote Renge. He's been able to do that since the second installment of the game. The game is actually very close to the source material, as they rarely make up moves for characters or give them things that they shouldn't have.