A World without a World Map

Hello again!

Every few months or so I chip away at something new for my hack. The plan is to make an original game. Even if I never finish, it's fun to mess around with hacking this game.

I'm curious, is it theoretically possible to create a game without bothering to use the world maps? I figure I'd need to cut out the Warp spell/warp stones, but does anything else get messed up? Will I still need to set a parent map?