You have to understand that table management in UD is a total bear, because of the way Unraid is designed and the constant refresh of the UD page to keep information current.
I'm not comfortable with any ideas I've come up with yet. I'm also hesitant to do changes to respond to one user's request. I want features to be applicable to all users.
That being said, I'll ponder it a bit and see if I can come up with something that might work.
Edit: I do see a way you can organize the passed through disks together. Give each disk an alias name like: Pass1, Pass2, Pass3, etc and all the Pass... names will be grouped together on the UD page.