I don't currently have plans to add the auto-map feature. If I were to continue working on this addon, the auto-map would be pretty low on the priority list. Here's a non-exhaustive list of things that would probably happen sooner than the auto-map:

1. Loading textures from the wad containing the map, which would simplify loading Doom 1 maps with full textures while having the Doom 2 wad installed.
2. Improving my MIDI player and integrating it so you can listen to Doom's music.
3. Fixing gmDoom's projectiles so they work properly with CONTENTS_GRATE, then enabling CONTENTS_GRATE on the appropriate linedefs

None of these items are a promise, I may or may not get around to implementing these.