i mean... for any% it's not against the rules, but should it be? I think it depends, but that's for the moderators to decide.

It doesn’t need to be in the rules, it’s common sense modification of the game is banned. lol

true I think it's obvious

Unless the rules say you can (or have to), you cant use mods

Under the general site rules, modifying games is not allowed unless explicitly stated in the game rules.

https://www.speedrun.com/knowledgebase/site-rules