I kind of doubt that will be happening, sadly. It appears that the MC developer hasn’t worked on it in a while (and I don’t think he will be).
However, I did find a different option after searching some: There appears to be a mod for minecraft that allows it to go fullscreen for HDTVs. http://www.minecraftforum.net/forums/other-platforms/minecraft-pi-edition/1960005-survival-mode-patch
I installed it like he recommends, but like another poster further down, it throws an error when trying to run (from desktop or xinit). “Couldn’t create SDL window”. I’ve PM’d the author, hoping to hear back (although somewhat doubtful).
As for the exit button, I decided just to make a python script that returned the words “Press Alt+Ctr+Backspace to exit!” at the beginning of the game. Crude, I know, but it works :P