There are a lot more qualities than those specified explicitly in Sonarr. Ever wondered why HDTV (the 480p ones) is considered SDTV and renamed as such? And BDRip is considered DVD?
Essentially we have 3 sources and 3 resolutions. TV, Disk, Web. 480p, 720p, 1080p.
We just don’t want to create too many qualities.
Please bear in mind that there are 3 different WEBRIPs: WEBRIP (480p), 720p.WEBRIP and 1080p.WEBRIP.
Would you add those 3 separately? Do you want HDTV separate too then? What about all BDRip variants out there?
But the bottom line is, such ‘bad’ webrips ought to be nuked and/or blacklisted, it’s simply bad quality control by the release group (p2p-group most likely).
My recommendation would be to simply add webrip to your rejected keywords list.
That said, it’s not possible in Sonarr to consider one quality equal to the other, while still preserving it’s quality name.
If we added some kind of ‘quality groups’ we would be able to lump together different qualities in those 9 predefined categories, for the majority of users, while allowing advanced users to modify them.