I'd love to use the "Extra quality levels" option, but I'm currently only setting it to 1 additional level past the 3 you normally add, just because every level after 8 is the same black circles icon, making it impossible to tell the really high qualities apart at a glance anymore.

Would it be possible for you to include additional custom icons for the optional extra levels? At least some amount of them?

So I wouldn't make custom icons for each. One approach could be to generate different colour patterns for each, which I'm not completely opposed to.

The design reason for not doing this is that I didn't think it would add much benefit. At that level of quality things are very likely going to be automated and telling the levels of individual items apart just by the icons is unlikely in my mind, and the order isn't easily remembered. It's the same reason I left the names as x8-x99, instead of having to recall that Spectacular quality is after Impressive or whatever.

All that to say, not immediately, but I may incorporate it in a future release.