Matt from Germany writes:
I've found a habit which I can't tell is good or bad. I will frequently cross over my thumb to the other side of my index finger to make a roll happen. For example, I'll roll from strings 4 to 3 to 2 using thumb, index, thumb. It's not comfortable and I'm not sure it should be. Should I make this habit second-nature, or try to avoid this kind of rolling where possible?