Abundant Revelations (Ultimate Magic) allows more uses of the same revelation per day.
Extra Revelation (Advanced Player's Guide) gives an extra revelation.
I don't think there's a generic feat for adding uses per day to sorcerer/wizard class abilities, probably because they vary widely. There is Sorcerous Bloodstrike, which gives you back one use per day of a sorcerer bloodline ability when you kill (well, reduce to 0 or fewer hit points) something with a sorcerer spell.
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Is there any feat that allows for additional uses of revelation abilites, or of miscellaneous per-day abilities (like the ones sorcerers and wizards often get)?
For Revelations specifically, there's the Abundant Revelations Feat from Ultimate Magic (though I'd say it's not worth it). Most other stuff, you're stuck with raising the stat it's based on, or occasionally using som Races' alternate Favored Class bonuses.