Yeah, that would be annoying in istagib matches, if your arm got stuck someplace and someone hit it...
One problem is that if you want it to move with the body, you gotta find out somehow, how the mesh is standing.
Take running for example
The legs move back and forth, and seeing from the side, you could shoot the player between the legs when they're apart, if the cylinder isn't moving like the legs...
But that might be a bit picky...
But the very best should be if then engine could cope with realtime polygon-hits on the mesh...
Although it might prove to be bad, since many ppl might cheat by using a smaller mesh, like the female...
I thought that's how it worked before I knew the topic "collision cylinder"...