I would love this option personally, I have the same issue. I have auto-updates once a week so this is just annoying. Maybe an option if it gets n days old?
Also, just updated to Unraid 6.11.1. I have some 'docker container x had update' warnings in ignored section. I went to add some now, I click ignore warning, I click OK to confirm, I get green check, but it doesnt move to bottom section until I click rescan. I'm pretty sure it went straight to bottom before hand - is this a new bug or am I mis-remembering?