the button layout is internally already configurable, the values are only hardcoded into the source code. So implementing this and custom control layouts is definitely something you can hope on being implemented soon.The world is 128 blocks high(like in the old versions of Minecraft). I already fixed some game crashing bugs, but I've never tried to reach the height limit, maybe theres a bug which happens when you reach it, I will look into this.EDIT:here is an image of the newest version of Craftus(note: the tree was built by myself, to test the rendering of transparent blocks. The holes in the ground were also done by myself):