Here's a rather interesting question:
Provided that you had points for the CHA and stuff, would it be a ok idea for FvS to slot impolison in a level 9 spell slot whenever possible? I know, some may think its a crazy idea because a typical melee FvS would dump wis, but with the new changes to insta-kill spells, it might actually be a way for melee FvS to increase their DPS against trash and other susceptable mobs to a degree when its available...