My main wish for favorites is to be able to have exclude filters in them (so my Deadpool (Movieverse) favorite could include -spideypool by default or Guardian could default to English language) or even favorite an entire filter search with a bunch of modifiers and give it a custom name (so that I could have "highlander, kudos sort, complete works, no crossovers, posted in last six months, >500 words"), but honestly that's what bookmarks are for and sometimes it's good to just have a simple feature that is simple!