Sorry! I cant use JOSM so ill just leave the dissection and reformation of multigons alone for now.

Got it!

Got it!

Fantastic, thank you!

Got it! I'll go through the other places I added these details for and see if anything else can be re-applied as nodes instead of tags

Got it! Is there a way to mass-edit tags for a certain route? Or check for a certain value of tag within a specific area?

Probably not! I fixed it

Good catch, I forgot I did that. I'll remove that relation for now

Got it, thank you! I went and re-did the closure.