A couple of generic weapon ideas (Usable by all human sized operators, like the generic Axes, Revolver etc)

[Dexta]

Ravens Beak/War Pick
Single target only for obvious reasons but massive weakspot/AP damage

Double Barrel Shotgun
Like Ogryns Kickback but two shots, Left click one shot, Right click fires both barrels, Special loads two rounds of custom shells.

Shock Maul
Used by Arbites, special attack delivers a shock that paralyzes the enemies like Psykers electricity.