I don't see the benefit in this.
We already have a Killing grenade for Humans that kill zombies,and the Infection Nade on Zombies that infects Humans(even in God Mod)
These nades are already strong as they are.
For the immune stuff,Zombies Already have Zombie Maddness and Humans can Spam Armor(same like immune)+Humans have Jetpacks,Tryder,Sonic,lm and additinal stronger weapons.
As for Plague and Swarm Rounds if we added bombs for Zombies and Immunes for Humans then whats the point in adding them at all(its going to be the same gameplay as it is)
one will throw bomb one will go immune and there's no point to it.
Additionally Swarm and Plague rounds are good as they are i belive.(Zombies vs Humans and + Nemesis againts Survivors in Plague)
I appriciate you taking the time and making suggestions but for this one i dont see the benefit in it.