I love lock image/ lock transparency! And there is very little I would add to it. However when drawing a video game background it is rare that you have nothing but transparency for the background. what I suggest is just like when you use the brush tool and cut out an image with the secondary color it acts as alpha. Maybe it would be a good idea and make the secondary color in lock transparency the transparent color then this would become even more powerful. and as always please let it work for 3d as well. thanks in advance.