I haven't read all post other than the one 4-lom posted above. And I think we already have a somewhat "favorite" hat thing going on. It's called "Hat sorting" which puts your last worn hat on the first page so it's simple to get to when you just hold your character and slide to the hat icon and you can change it in 1.5 seconds quickly.I mean that's probably as simple as it needs to be I think. Not sure how or why you'd need to make getting to a certain hat quicker. Even if they made a option where you could say /loadhat1 I don't see it being realistically or even noticeably faster.
Also idk if hat sorting is a option for people in IOS or PC I'm going to go on the ASSUMPTION it is. But I hate talking about anything in the damn settings for graal because they for some odd reason aren't the same between all platforms. Why I don't have a damn clue nor do I have a damn clue why I think the developers of classic seriously thought that was necessary to implement.