Hah, I thought the same for years, but then I realized it’s a simple as:
- click create
- project: BookBrainz
- issue type: Improvement (or whatever)
Then just write what you wrote here.
We’re often asking a dev or a volunteer to spend hours fixing something, so a few minutes wrestling with the ticket system is a small price! But again, no pressure, consider it the lightest of nudges 
P.s. It really did take me years…