Being able to texture blocks would be a huuuuge plus for me. Like having a texture pallet, or even better just have every block be availble with all textures from a pallet of options. And yes, spaces that the block does not physically exist in needs to go! Especially moving platforms.
I hope the side ways moving platform will have a top of the grid piece and a bottom of the grid piece. Yes, the platform does need to take up blocks, but having only sideways moving platforms on the top of the grid sometimes ruins my map ideas.