So, who else switches back and forth between fighters?

I do this very often and at the moment my most played ones are Third Strike and Mortal Kombat. Unfortunately, this leads to me accidentally pressing down and block to sweep or holding back to block in Mortal Kombat and trying to breaker combos or pressing HK and 3K to do a Super Art in third strike.

Who else has problems with transitioning smoothly, I just can't do it. And I'm greedy as hell, so I'm not choosing one and sticking there, I love Sub-zero and Dudley too much!