A rumble feature.
Maybe have the PCB suspended above the case inside by some sort of wires/springs/cushion, and have some rumble inducing device attached to the PCB. When you get shot/crash/hurt etc, the PCB and keys will rumble, giving feedback to your fingers, but it won't transfer through to your case and therefore desk, making that noise I remember from putting an N64 controller on my hard wood floor as a kid.
You could upgrade the feet to so they are more shock absorbent as an extra precaution.