Questions about MNG

Hi! I'm interested in using MNG in my game, but I have a few questions:

Does MNG support overlapping layers and still images with those 
overlapping layers?

If not, would it be possible to have it added?

Does MNG support linking text to colors? (e.g. mapping colors to text)

If not, would it be possible to have it added?

My plans basically involve using MNG for GUI layouts. This basically 
means having an MNG called "layout.mng" containing layers like 
"background", "foreground" and "overlay", then using colors to represent 
UI elements and images (e.g. the background layer could be a solid color 
that references a background image "background.png"). UI elements would 
be further MNGs and so on until either code or an image is reached.

Thanks.