No, I did not. I'm not saying that roleplaying as the villain is a bad thing (I've done it as the Dungeon Master for my friends), but when I'm a Player Character, I tend to try to make the choices I would make in real life. In that case, then yes, I do tend to find moments in RPGs where I didn't have the heart to do the wrong thing, but the only difference is that I feel these emotional dilemmas when I feel that both choices are the "wrong thing".
For example, take Dragon Age 2. **massive spoilers upcoming**
I fought for the mages, but a mage in my party not only lit the fuse that started the war between the Templars and the mages, but also validated the idea that mages are crazy nuts that are inherently a danger to themselves and everyone else and must be subjugated under slave labor or wiped out. And then I was given the choice to either kill him or just forgive him for no reason other than "he's my friend." I didn't like either of these options and I was stuck staring at the screen for half an hour before I knew what choice I would make in this situation. And still, it's against my beliefs. What I did love about this was that there was no karma meter, only how your choices affected the party members around you, which is much more real.
*end spoilers*
I don't want to be accused of being off-topic or even rude, but rather that a topic named morality should be free to address all aspects of morality.