I think it must be fun to add maneuver "Roll"(Fig.1) to stylish movement like immelmann turn or Split S.

I'm enjoying this mod, thank you. ; )

i personally think roll would be nicer too, would allow for some more fun maneuvers, especially with the booster upgrade, it is a real pain rn if you go inverted rn, but having roll control would only mean you have to do a roll

Fig.1

Do you mean to change roll without changing yaw?

No, I think yaw is incompatible with roll.
The idea is this:
・Removing yaw status
・Change yaw input(now assigned to "A" and "D"), into Roll input.
When a player want to turn right, he need push "D" for a bit to roll some degrees, and push "W" to pitch up.
I think body control becomes a bit harder, but the movements will be nice.

It's done in version 5.0.0.