So, I'm running Rise of the Runelords, and my party has been dominated by the two mystic theurges and the paladin, leaving the rogue and the monk out in the cold. I've decided to buff the monk, basically splicing Master of Many Styles onto him to give him more versatility. The rogue, however, I'm still kinda turning over in my head. I don't just want to give him bigger numbers, I want to make him more versatile so that he can contribute a bit more in and out of combat.
Does anyone have any novel suggestions? He's playing his rogue mostly as an archer (but occasionally uses a rapier), poorly optimized. High Dex & Int, low Str & Cha. Wanted to kinda be a skill monkey, but the casters are so far ahead of him in that regard it's silly.