Joystick + Keyboard?

I'm having trouble getting a decent control scheme down for this game. It seems as though if I have a joystick enabled, I won't be able to use some of the keyboard controls.

Basically I want it laid out so I use W/S for throttle, A/D for yaw, joystick for pitch/roll. I configured the controls as such, but WASD does nothing, however many other keyboard controls do work. I really don't like the way the Joystick's X-axis controls both roll and yaw. It's an old game so I'm not expecting much, but is there a workaround for this or am I just going to have to deal with it?

I'm not entirely sure on this but as far as I'm aware, re-binding controls to keys that are already assigned will clear the other control.