It's a decent idea, but I think it wouldn't be good to detach the aircraft's wings for a suicide run. The autopilot would probably have a much easier time guiding the aircraft to target if it still has the main lifting surfaces and ailerons attached.
That said, if you're at the point where a vehicle is in such condition that the pilot has to abandon it, I'm not sure that it would be possible to target anything for a suicide run before the plane would be shot out of the sky or otherwise stop functioning. Still, since I reckon it'd mostly require a software modification, it probably doesn't add much to the cost, so o/ Tezar