Well, I have an idea that might fix our "no terrain/interior maps" problem.
Upon starting a server you have options to either build the land yourself, or have the land pre-built for you, but it can be edited and made to your exact liking with an add-on that lets you generate the "brick terrain", Which could add oceans/lakes, mountains, beaches, plains, deserts, etc... Kinda how the Terrain generator works.
And with the vehicle physics, Well, lets hope they get an upgrade to something far better, something that isn't complete stuff and wont be glitchy.