I dont know how active the development is for this Add-on but its amazing. being able to load maps that are not only playable but also have true collision directly from the wad its amazing and i congratulate you on that.

That being said i do have a couple of suggestions wich i hope are not too oulandish

-the first one its the most ignorant one because i have no idea how hard this was to make or how it manages to rip a doom level and turn it into a 3d object in source but, could it be possible to make the doom sectors have their original lighting?, if so then it could be a good update to the mod

- the second one its a bit more complex but i think it can be done, correct me if im wrong but, maybe it could be possible to have the add-on be able to pull custom textures (just textures) from Iwads. i noticed that while loading megawad levels that the geometry is there but as expected custom textures are either missing or replaced by stock doom textures (like icarus for example). could it be possible to make the add-on be able to load these textures?, or does GMdoom´s code make that impossible?

I hope that you can see my post and that my suggestions are too ignorant or outlandish.
thank you.