Maidhc O Casain
Na Bith Mo Riocht Tá!
I'm also thinking about adding performance combat to the list of NO.
YES to performance combat. It adds complications, but only if a DM wants to use it. I don't see the reason to disallow them as basis if such things come up in an adventure.
I like the Performance Combat as well, and was considering a Rogue (Knife Expert) build using them as my third character. The builds I toyed around with were far from optimal, but would have been fun to play I think.