Are you certain? The card says "no other effects of the attack" which would seem to indicate things like Armor Piercing or Blessed Weapon or the like. Powerful Weapon, on the other hand, just changes how boosting with focus works. I don't see an issue with it (especially as you will *maybe* get a second model in there).
Enough waiting. We want WarmarmotsMercs & Minions sheet
IK Alphabets Guide
Battle College
Savage Iron Kingdoms
I'm sure.
Try reading this post. Don't mind the age of the post; there has been no reversing rulings since it was written.