I'm mainly a TeX.SE user.
Since I have not much time to answer, I usually mark the answerable (by me) questions as favorite and when I have time, if nobody else already answered, I do it.
But with this way, I cannot discern the answerable posts from the ones which are actually my favorites.
Is there a chance to create another option other than the favorite star?
Edit (reply to nicael's answer): Instead of creating a new button, we could leave only the star, but with the chance of choosing, for example, its color. So I can mark my favorite with a gold star, the one I could answer with a green star, the one I like the most with a red star, and so on.