There's currently a very big problem with the Waagh...it's fully optional and often just taking the "best" trophy of your choice and then never activating the Waagh again and instead enjoying the campaign bonuses for full reputation is the better course of action..
Oi, dat's not Orky 'nuff! Dat's da screwy fings da pointy-eared gitz would do!
So here's my proposal:
-once you reach max reputation, you get four turns to pick a target
-if you fail to pick a target, you disappoint the boyz and lose half of your reputation
-trophies are lost whenever you reach max repuation. Orks do not remember such things for long, they live in the present! Gotta' keep the boyz entertained!