P: Allow configuration of location and max size of preview and smart preview cache

Yes, a catalog can be stored reliably on a network drive by using a workaround to avoid the error message that normally prevents this.  I've used catalogs on a NAS for over a decade without experiencing corruption and I've researched why this is technically sound.  See details and references at https://github.com/kgorlen/lightroom.

It's also currently possible to have the preview cache on a local SSD with the catalog on a network drive.  But it's bad practice because the workaround to enable this causes the .lrcat.lock, .lrcat-shm, and .lrcat-wal files to reside on a different storage device than the catalog.

The catlog cannot be stored on a network drive or NAS. If you try it, you'll get an error message or worse!

Ideally, the catalog should be stored on your fastest drive.

Allow the location of the previews cache to be changed so that it can be stored separately from the catalog.  This would allow the previews to be stored on an SSD to improve performance when the catalog is stored on a slower devce, e.g. a network drive.