since every wiz can stun i think it shoulnt be removed or add any modify on it. There are spells that can prevent get stunned. Also u can make languid recover pots to take it off, get remove curse or dual 1 priest spell. Resist paralysis rare?
Make the curses so that if you fail to right click on your enemy then you're the one whos gonna take the spells effect . Think that would discourage using curses a bit, and also would add some fun to game, seeing some wizzies stun themselves