You know, this was something I knew about Doom's skill levels and whatnot... But suddenly, it has given me a bunch of really bad ideas...
"Skill flags work on any thing, not just monsters. You could add more ammo, change weapons, block a hallway with decorations, move keys, or even rearrange teleporter destinations and spawn points."
(https://eev.ee/blog/2015/12/19/you-should-make-a-doom-level-part-1/)
If I read this correctly, I could theoretically use skill levels to make a single level utilise different routes, by blocking paths with decorations...
Oh god... Why am I like this?!