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There are a zillion feats available to enhance Stunning Fist, and a similar number of abilities one can swap it out for. Can one take a feat like Stunning Fist Adept to enhance the DC of say, the knock-prone ability of Punishing Kick?
Also, am I hallucinating when I remember a feat that gives additional uses of Stunning Fist per day? Did the 90s Sinbad genie make it vanish or something?
No, if the ability applies to something you don't have, it does nothing.
As for the "feat," you're thinking of the Abundant Tactics Advanced Weapon Training option, which adds an additional number of uses per day to a feat by an amount equal to your Weapon Training bonus.
Abundant Tactics with options like Battle Cry or Barroom Brawler can make those feats really viable options to build around.