Scaler has, well, a lot of scales… The ability to favorite specific scales would be really useful for a whole bunch of reasons…
It could be a project or album focused around one or two modes, it could be favorite modes, it could be for bookmarking modes you discover that you want to make sure you come back to and explore… (The last example would be a big one for me personally of why this is useful)…
It could be denoted by a star, a heart, etc. Whatever method it would be useful to click favorites and see a filtered list of scales that fit a specific mood or project you’ve ticked…