Add a dildo as a secret weapon that does 100 damage a hit and swings super fast. And secondary fire throws it, doing 1000 damage if it hits.
There's a model at CDG forums if you need one.
=P
Just screwin with ya. There is one at CDG tho, saw it browsing the mdl forum aaaages ago.
oh, and make the rockethaus not be the house of rockets and add another shotgun that does 10000 damage per pellet.