Rythal I hope you get this
I know that Carbonite has a built in note system, but not as easy to manage as HandyNotes I think.
This person (
http://www.curse.com/addons/wow/handy-notes_carbonite ) is working on way to add Handy Notes to Carbonite.
You may wish to see what he has done, and see if he can help here.....
On the ither hand, although I know you have a proper road map you are following, you may add to the list the ability to add Notes via addon lists, such as HandyNotes has done. This would allow folks to upload notes and coords to Curse, or other venues that would then allow a direct update and markings on the Carbonite map.
There is a third option: Set up Carbonite notes to accept HandyNotes marking system to integrate with Carbonite mapping notes
Your call friend
Hope you had a great holiday season
and looking forward to testing the next Beta iteration
Regards