How come I've never come across this?!?!
I've read all of the original post and I've got to say, ALL of your ideas should be implemented.
Also, I hope you understand the implications of a smoke grenade. Smoke alone could shift the (un)balance between Attack and Defence into a very respectable state. No more "oh I'm Enforcer so I've got to Attack and probably lose the game again" without an actual fighting chance.