Feature request - transfer modes (Block differences) per directory

I would like a flag added to UrBackup - Server administration manual to allow a specific directory to use a transfer mode I specify.

I want to be able to set at client side directories like this:

Where c:\dir1\dir2 will use default flags, and then c:\dir1\dir3 will use the usual default flags plus require_snapshot and block_differences. That folder will then be backed up with block differences transfer mode and only from a snapshot.

I want this for directories like outlook pst files that are GBs big. In this case I want the client to use more cpu but less network for that folder specifically.