Unless I'm mistaken, it appears the Support gains a tremendous boost to the hurt gun if/when using a rapid fire controller. Can anyone confirm/deny?
If so, then it should be easy enough to fix in a patch. Now whether or not it will get done remains to be seen.
Asked a Live friend to kill me with the healgun via turbo and without - didn't see a difference. The hurtgun deals damage so long as it's locked onto a target doesn't need pushing fire over and over.