Cool! Will we ever get buildable vehicles or a build mode?
Buildable vehicles = Never. We can't do it with the actual blocks we use, and everything else comes out extremely inefficient and hacky. This will never be Garry's Mod. As for Build Mode... What? We... have that?
Some rough idea that popped up into my head, maybe use an actual BL scene for the background? I guess you could use fog emitters or something.
That means loading up the server with the game, reloading it each time you simply want to go to the main menu, plus any map business it might have. More likely for someone to screw over their entire game if things happen while within a game instead of just on the menu. Far too complex and possibly dangerous.