It probably was suggested before, but I personally would like to have an option to "sort" my neighbors, in several ways, more importantly, what was the last time they were active or how long they were active the "past week", I got so many neighbors, but many of them dont even play anymore, I cant be bothered trying to figure out which ones are or not playing anymore, at the time I get a new quest I have to ask help from my neighbors it might help not to flood your server since I send invitations to everyone.
Id also like to be able to sort them in other ways, such as, last time they gifted me something, last time they visited me, etc. but the principal reason is at the top