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NobleHeart: One variation of your multiplayer backgammon is called Chouette.
Your four colour backgammon sounds like a real challenge to design. It would need a different board and setup (eg, where are the home tables for the extra two players?), but it could be a great game. Extra players means extra possibilities, such as alliances (eg, green and blue could elect to share points which will block black and white). I'd say that Fencer has enough to do with all the existing games, the bug list and wishlist - so what time has he to spend creating a new game? - but if you were to give him a complete and well thought out design, something that can be implemented without any major development being required ... well, it could be the birth of something very special.
Abigail: Indeed, wouldn't a game with such tortoises be a draaaaaag! It's a good thing that time controls are getting more sophisticated. I look forward to the N moves per day option.
"you know who you are": Lol. I suspect some of them deny that reality but we certainly know who they are. One of my opponents has 2000 games going!!