Simple idea: the gorges healspray shoots more like the flamethrower than as the shotgun.
Wouldn't it be cool if you could just hose down your teammates with healing bacteria? I don't think there needs to be alot of change in the code. Just a looping spray animation and sound, and maybe a couple of numerical tweaks.
I'm not talking about making heal faster/stronger, just change the way it shoots out of the gorges mouth.