Need more sort options in DL Listing objects

User feedback indicates that we need to had some additional 'sort' options in the DL Listing object properties:

(i) Have the ability to reserve sort any of the existing sort options (e.g. 'modificationdate,title' currently shows the oldest document first rather than the most recent, so we'd like to reverse it!)

(ii) Add other sort options like 'title, modification date' and 'title, version'

I'm sure we can come up with a few other required sort options! :-)