I've been building a high level cleric with emphasis on channeling. I'd like to suggest a couple of extra feats.
Your channel affects a larger area.
Prerequisite: Improved Channel feat.
Benefit: You may channel to affect an area twice the normal area by taking a full round action and expending 2 daily uses.
Your channel has additional curative effects.
Prerequisite: Improved Channel feat.
Benefit: Your channel removes the following conditions: fatigued, shaken, sickened
Meta-channel feats? ;)