Formspecs currently always appear in the center of the screen. IMO it would be nice if we were able to set the position to make it appear e.g. on the bottom right. For some formspecs (e.g. awards or just those showing information), it's not really useful to have them block your screen.
Also it would be nice to be able to tell a form wheter it should block movement of the player or not. For an award, you shouldn't get blocked, while for a little menu you should.