I prefer Poison poison trap, personally. XD
Anyways, none of that is needed on Poison. It's already a great set. It has some holes that could be fixed (pbaoe alkaloid and antidote would be pretty killer), but it functions fine as is -- with the exception of Neurotoxic breath. That's a pooper of a power.
MM Gas needs a fix (perma plz), but yah. VG is definitely not a problem on poison and I for one would not have it changed, zero mez protection and all.