Allow change of material for each panel

I see in mass changes one can change the sizes of the panels but if you go to mass changes materials one can only change materials and not the material for each panel. Reason that this would help is that sometimes something is exposed and we will use a grained melamine on the exposed side/end and a white side/end on the side you don’t see as the grained melamine door covers it. Also if one just want to change the exposed side and door to another colour. Please see attached screenshots. 

https://maxcutsoftware.zendesk.com/agent/tickets/13160