Should marriages allow more partners?

I'm already using the "player" trait (added with a cheat code) to play a committed poly-amorous quad who all live together in one house. It would be nice if they had the option of getting married. And when I am playing with aliens or vampires especially, I'd like some other kinds of marriage arrangement options. But not having those options isn't a deal breaker for me, obviously, since I just make up the story in my head anyway. As long as there is a way (player trait) to prevent jealousy so sims can openly have more than one partner, I'm content.

If a multi-sim marriage option were added, I would use it. But first, they really need to make weddings actually function well. Even the base game version has been kind of annoying to use because sims don't stay seated during the ceremony.