Are there some key bindings for controlling 4wd, locking differentials or starting engine after it stalls? Or is there any way to set up custom inputs for these things?
Well you have to press alt+S for the 2wd/4wd and alt+D for the locking differentials but I don't know what to start the engine after it stalls.
You can also use the Powertrain debug app It will highlight switchable devices for you and you can click them. It also shows their current state.