Sync mobile devices with media from multiple libraries

[Scooby]

Hello,

To synchronize music on my phone, I like to prepare a dedicated playlist "offline" and plug/sync the phone when it's ready. For this purpose, I configured my mobile device to synchronize with this particular playlist and delete other files.

However, as playlists are not cross-libraries, I had to create 2 dedicated playlists but syncing with one deletes files from the other.

Could the list of playlists to synchronize with in the mobile device configuration panel include playlists of *all* libraries to be able to sync everything at once?

Thanks