Will this support Maximum Doom? It's basicily official.
No. Maximum Doom is 3461 levels, some of which are duplicates, some of which don't work, some of which are actually Heretic levels, etc. It's all freely available from other sources anyway (WadSmoosh is for compiling retail content) and even if it weren't there's no reasonable way to integrate such a big mess.
Nevermind did it manually (currently only have the first five levels)
Changed the Maximum Doom text to look better.