Should be pretty easy to implement. Just thought that it would be a good idea to add a "Add to contact list" button right next to the 'Send message" button that currently available on the personal profile page (see screenshot). From usability point of view, currently on moodle.org site if I want to add someone to my "contact list" (in message), I will have to first send him/her a "message" using the "Send message" button then the person will be added to your contact list, not very user-friendly if I want to just add them to my "message" contact list.

If people is busy I could help out implementing this. Let me know what you think (about whether this is a good idea).