You can't remove the stun effect of Storm Bolt. It's one of the worst problems early mappers face, since it woul be the perfect damaging spell otherwise. Use something like Shadow Strike, with only Initial Damage.
Use Acid Bomb and set the AoE fields to 0 and the buff duration to 0.01 sec. And just remove all the other disabling aspects of it (armour/speed/attack reduction, etc).
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.