Common Virtual pool for all pools (Array, Cache, mounted devices) - regarding split level and choice for placement of new files

I would like to control whether folders are stored on SSD or HDD storage, and/or possible my tmpssd storage from separate device without mirror. This way I can move folders from hdd to ssd, as my ssd storage increases over time, and/or my needs change. I can do that move without having to change location used by scripts and people for my files, because unRaid as this cool /mnt/user view of everything.

Currently in Shares I can choose Primary storage / secondary storage. Here I want Primary storage as the Common virtual pool, and then all disks should appear in include/exclude, and split level / new-files affect all regardless of source pool.

I think this is a more generically useful abstraction that abstracts away the pool setup from the shares. I don't care about the mover anymore, so for this I wouldn't need a mover, and if that should change, I would just create a script to do the moving, which is easy compared to changing how unraid selects new file location, which I think is a black box I cannot change.

See more details about my use case here: https://forums.unraid.net/topic/191966-howto-use-common-share-for-2-separate-pools-one-with-ssds-and-one-with-hdds-where-i-control-what-goes-where/