"This also ties in with dynamic walls I've also been toying with... that's another story though."
Does it have some relation to "maze dungeons" we were talking about like 1 month+ earlier? ;D
"Tear Gas, which is just a variant of mustard gas that will disorient everyone in it instead of poison."
Would be fun if it could apply crippled eye state for a period of time. Though I doubt that FO engine supports such thing.
"The plasma grenade needs help"
Just make it a molotov variation, but with plasma damage instead of fire. (radioactive pool is a nice model for that).
"Also debating if I should let you throw nades while running as a free action."
I doubt that this is ok ;DD, or at least with a penalty for max range. Because otherwise (to make it superb), you'll have to add nade physics ^^ (http://www.youtube.com/watch?v=eDK09mKjG2U&list=PLHF999pjo89OKE2X_sudbAqQonX6Kz_BI&index=13)