they're going to release user made meshes some time this year
check the gametest site
Finally. Seems like they realized how much of a mistake that was. I sure hope they bring back user sounds too.
Also, the studio is a piece of stuff. Not only is it hard to find what you're looking for, moving bricks around sometimes gets stuck at 1/5th stud and you can't get the bricks to align properly without having made a right angle previously and setting disabling the stud snap.
And since when do wands duplicate the brick on your head? They used to duplicate the brick on the brick you're duplicating.