Ground polys and seasons

I am using P3Dv4 and ADE1.76.6715. Does ADE-GP support custom seasonal variations of ground polys (a set of bmps with _sp, _wi, _fa, etc. plus _lm for night)? I see no mention of that in the ADE-GP manual. If it does do I just put my set of textures (all of the seasons plus LM) into the Textures folder and the right thing happens, or do I need to do something special?