On a related note, the original Mac demo includes functional fake multiplayer with bots, whereas in DOS shareware v1.3d the bot AI is missing. However, with the latest version of EDuke32, any attempts to launch fake multiplayer with either the DOS shareware or the Mac demo GRP result in glitchy behaviour that is basically unplayable.
Spoiler
I have quickly Googled the forums here on this issue but haven't found any recent posts concerning the fake multiplayer mode.