There is no right click add to Live Mesh feature in Windows Live Mesh.
Live Mesh beta support has ended.
For discussion of the new Windows Live Mesh (formerly Sync), (as well as the released Live Sync version) go here:
http://windowslivehelp.com/forums.aspx?productid=24
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~