It would speed things up greatly if I could sell all 1s and 2s immediately.
Heck, if championing turns out to be not real, then I would request a sell all 3s button as well. It would speed things up without accidentally selling any 4s or 5s. Because all 1-3 covers are now junk for me, just useful for the ISO.
I doubt this was the first request for this (I remember seeing it many times, here is one from November 2015 https://forums.505go.com/discussion/35317), but here we are a mere eight months from this request and six months from when everyone REALLY needed it (when champions went live and everyone opened their huge hoards).