The only issue I have noticed so far is that I get the following error messages upon launch: "AimingCamera 1: Can't find TID 0" "AimingCamera 10: Can't find TID 0" Thankfully, they do not seem to impact the gameplay.
Out of curiosity, is there a way to disable the main menu music? I have made a special music addon made of Mega Man X midi tracks just for this mod, but I have been unable to override the main menu theme; erasing the ogg file will only give me dead silence and the game will not play my custom D_INTRO!
Finally, have you considered making the mod compatible with Heretic? I reckon it would be fun to fight through those levels with HAB's arsenal.