Unless modders need the "normal" Africa background, units etc. they could modify the theater setting via editor so that "Africa" represents something else, like here a winter setting. By using this for a European campaign units could automatically switch to winter camo in any scenario using the African theatre, and switch back to normal looks in Europe provided they sit in the mods units/desert subfolder. Maybe there are other possibilities I haven't thought of yet.
There are some cons though:
- extra work to get units in winter camo (though DCS is a huge help)
- needs fitting wheather settings, in my test I had set frozen ground for the whole scn
- probably usueful for GME mods only due to the extra gfx needed
- whenever the theater is set to Africa, the game plays AK music in those scns (which I like though)
edit: the pic above was made using Massi's terrain gfx
Of course if you have not turned on the reverse. 
