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You could make it a two feat process, with half of the damage being standard positive or negative energy damage and the other half being the appropriate elemental energy damage (if the cleric has two elemental domains, he'd have to choose one, or buy the feat a second time if he wants the option of doing half-channel/half-electricity *or* half-channel/half-cold, for a Gozran Air / Water domain cleric).
Then the second feat could allow a channel that is pure elemental energy, with no positive or negative. Just raw electricity (or fire, acid or cold).
Another feat could add a secondary effect, like anyone who takes fire damage from your channel also catches on fire, if they fail their save. The electricity effect could stagger them for one round, the cold effect could entangle them in a frosty buildup for 1 round and the acid effect could render them sickened and give them a 20% miss chance for 1 round, or something silly. (Just tossing out whacky secondary effects, not at all balanced...)
Skipping the feat entirely, an elemental domain cleric willing to cut their healing channel in half (or eliminate it entirely?) could have a full strength (not halved) damaging channel that does elemental damage, perhaps, as an 'alternate class feature,' if the GM is cool with that. Selective Channeling would probably be a good idea, if one doesn't want to risk blowing up one's allies with elemental 'splosions.