Make each folder that you want to stay only on disk 2 its own share which includes only disk 2, instead of making them subfolders of shares that also include other disks.
I want Photos, Music, TV shows (and the Family genre under Movies) to all show up in Media though. I don't want two separate media folders that I need to browse to for media content.
If I temporarily set the minimum free space to something larger than what's available on disk 1, will unRAID create the appropriate shared folder on disk 2?