I don't know if I have mentioned it here before, I have certainly mentioned it a lot to my friends ingame.
I will not start playing my adventurer again before we get 'rollerrat polymorph'!!
The polymorph should turn the adventurer into a rollerrat (make sure you get the attack sounds right!) -- when in rollerrat state, the adventurer gets an extra chance of making a crit, more running speed. Rollerrat polymorphs will also weaken the evades a bit.
Rollerrats are agressive beasts, the buff/changes should reflect that.