Thanks, Rip.  I don't think that you can do that right now.  I was under the impression you could change the hit sound you hear in tanks, say to a huge explosion that would be more indicative of a 75mm cannon hitting you, but then that is also the sound you would hear when you were shot by machine guns from a straffing plane.  I'd love for someone to tell me I am wrong, tho.
Gordo