We've been testing this for some time now, and I can finally say that the patch has reached it's final beta stage.
A data disc inserted into the core or any of the MD's will be added to the system with it's content showing in the relevant media views.
The content can be played any where you like with all the regular functionality. The patch works for 0710 and 0810 both 32 & 64 bit.
The only thing that could not be resolved is the eject button functionality. You can eject the disc only using the "manage drives" menu.
I've uploaded the diff and the script to the svn http://svn.linuxmce.org/trac.cgi/ticket/142
Any one interested in testing this please PM me with your mail.