This is an odd question, but do you ever plan on supporting third-party doom engine releases (Heretic, Hexen, Hacx, etc)? It'd be neat to have all of them bundled into one big IWAD
As far as how GZDoom thinks about all its supported titles, everything Doom is all a single "game" and Heretic, Hexen, and Strife are all separate games, and it's not possible to have them all coexist within a single session.
