Hi,
I have read the thread regarding the development of a DS and Xbox version. I don't know if this is possible but could an iOS/Android version be made. The two main problems in making non pc versions seem to be as follows:
I don't know about the first one but the second can be solved. Have a zoom window like in the pc powder toy but controll the zoom size be dragging with two fingers on the main part of the screen. Pinch and it would zoom out and pull and it would zoom in. To change the brush size a pull down (or pull up, depends on the location) tab. On the tab would be a slider to control the brush size and a three buttons to control the brush type (triangle, square and circle). The element tabs would remain the same with the exception of some two layered tabs.