First question one needs to ask is if pass is forcing. There are definitely some good arguments for it, I guess forcing is the best way to play this but I haven't thought about this before.
If I think partner will interpret pass as forcing, then imo that's the best option. Otherwise I prefer 5♠.
"It may be rude to leave to go to the bathroom, but it's downright stupid to sit there and piss yourself" - blackshoe