Implement mesh in maxscript where every face has its own color

I would like to implement a mesh in maxsript where every face has its own color value, absolutely not related to any vertex colors. If I select a face the coresponding color value should be shown and it should be posible to edit it. If faces are deleted or added the coresponding color values should be also deleted or added.
First I was thinking of a scripted plugin which extends editable mesh, but as far I read extending editable mesh doesnt really work.