Many mods use alpacas method of mod foldering campaign files to avoid overwriting vanilla files, but you may have noticed that this doesn't work with the MP campaign. When using mod foldered files, the game only loads them for the single player campaign. I have developed a method, very similar to alpacas, that allows the use of mod foldered files in MP campaigns, finally eliminating the need to overwrite vanilla campaign map files once and for all.
ETW equivalent of this tutorial.
Let me know if there are any issue with it - I'll try and fix em straight away