He can make it more difficult due to the monsters having a heightened sense of security and planning due to the previous assault.
He could put 3 feats into hitting people with boomerangs.
The focused archery fighter is better than the cleric at archery for the majority of the levels. I think level 12 is the breaking point with stacking turning rods, and Planar Ally and no Targeteer. Pathfinder fighter would probably push that back a bit, but I don't know the details of all the stealth nerfs they did to really make that call.
I would nerf both of those, but I don't think my nerf would hit the clerics planar ally.
I can't help think of a party with a Truenamer all chanting together to help the him make his truenaming check.
Party:Red rover red rover send send the monk over!
Truenamer: *rolls dice gets 14* Got it.
Monk: *Moves forward* "AIIII!!!"
Truenamer: "Why was he a level higher than the rest of us?"