The only places where they're mixed are alt, ptr, bc, and rs, which are the pages with the least amount of content besides mon which is the youngest page out of all of them. Personally, I really don't see a need to divide these already small pages into even smaller pages.
Since you're already scrolling through the images to find something you like, what does it matter if there are furry images in the mix too? It really doesn't add much time to your search.
And if you really really can't stand seeing furry images at all in your fetish art, why not just make a thread for "human -fetish-" make a thread for human watersports, human vore or whatever.
But I think for the most part no one really cares if their peas touch their mashed potatoes, so why bother making a separate plate?