steering wheel button behaves different than keyboard button

[joevenzon]

If you define the button options as down and held in the "assign controls" menu, it should work as you want. For example, I've got a joystick button mapped to the handbrake as held/once and it works fine. Make sure you delete any other controls assigned to that function.

In vamosworld.cpp@1156 you'll find the code for querying for joystick state.