I'm playing with a xbox controller. The camera is assigned to the right stick, and it occasionally bounces back. If I could assign LT and RT to c left and c right while still having the right stick for muscle memory, that'd be great.

Check the "Controller Restrictions" in the Game Rules ^^

Oh, I was only checking the category guides. For anyone looking for it, it's on https://www.speedrun.com/sm64 > View Rules > Game Rules