I'm not 100% sure is somebody have suggested this idea before but Warpless%. It can be used for all main board categories. It's basically a run where you can't warp to any check points on the map. You also are not allowed to warp to the Odyssey. Death warping is fine but you can't warp from the map.

wouldnt that only be any% but just longer the only place i know where you teleport to a checkpoint or warp is snow, seaside, metro(warp), (maybe sand)

Yeah. I know it sounds boring, but for thee postgame stuff, I think it'll be interesting.

For Any% (and maybe world peace, idk) this would not work. It would just mean minor changes to the route and dying at the end every other kingdom. For Darker, AUM, Hundo, all those i'll admit this could be a really cool idea. Problem is until it is actually routed noone would want to run it, it's just those categories unnecessarily extended. If you want to do this just submit it to the main boards as that category normally.