I have, since I started playing, noticed the system that FH uses shares its servers with everyone in the same map, but all the maps are client-side it seems, so if you have the correct editing software, you could be in the same realm as someone, but on a map that is drastically different. This, to me, is a very strange concept, as this is very contrasting from the other editors I come from, like UnrealEd or SecondLife. Particularly having to manually download presets, that seems like so much of an inconvenience to make them not worthwhile to spend the time making.
As far as floating and glitching go, this game has more than a few places where you can pierce the collision boxes and get into and on top of all sorts of things you couldn't in a different physics system.