Two emotes I'd like to see is great joy (for victory) and great sorrow (for party member fallen).

Yeah, it's a limited use feature, only for a bit of immersion. I'm only talking about if their choreographers and animators have extra stuff already mostly done. If I had to choose between this and say ironing out kinks in the Raphael plot, I'd choose the latter of course.

Agree that if anything it should probably be a use of performance skill or Performer feat.

If it were implemented, have obvious scenes where NPCs ntice and interact; the victory party at camp, saving the myconids, dance floor in Elfsong Inn in Baldur's Gate, heck - maybe even the harpies? (auto-failure to their charm!)

Type of dance? A mash-up. Dance scene from A Knight's Tale springs to mind; medieval line dancing but with David Bowie (a fav of mine!).