I was talking in the Steam controller thread about a control scheme where a flick on the left stick in either direction will execute a barrel roll while in the air. I think I found the most balanced solution. The config is based on Nigerian Waxcheeks' setup where the right trigger is accelerate + boost (soft/hard pull).
I wanted this setup because there were some situations where I miss a button press and fail a barrel roll, sometimes missing a shot on the goal. With this setup, this should not happen anymore.
There is one "problem": You cannot use the whole range of the left stick to steer. So while you may be used to push the stick all the way to the left to turn, this is now no longer possible. The outer ring binding radius is at about 3/4 of the usual range. Setting the outer ring binding radius one additional notch to the ride will "disable" the barrel rolls for up/right/left/down. Funnily enough, if you push a diagonal direction, the barrel rolls work with the increased value. I don't know why it doesn't work with just left/right etc.
The config is called Barrel Cheeks. I guess the same setup may also be possible with the left touch pad.
EDIT: Well, there is a problem with this setup in the main menu. You would need to use the d-pad to to navigate because otherwise you will only move one field an automatically choose it. Damn, this sucks
EDIT 2: Hmmm, well, no, doesn't really work. You have to be really careful not to jump while turning in a hectic situation. Would demand too much adjustment from past gaming experiences.