Please add the option to specify a background color for /sili, or overlay it over the current image.

Bitmap compositing with alpha channel is definately possible with GDI+, which signartist already uses anyway to auto-resize the pictures, so a new command that loads a transparent image onto an existing one is doable. Given that /silt and /sili already retrieve transparent images, it should be a minor modification. Well... IF umod is able to read the stored images that are already on the paintable deployables...