MDLSITE-265 that I consider interesting.... I would propose to improve a bit the the "register" button visualization in admin main page (admin/index.php).
1) Now, it shows the "Please register your site to remove this button" if the site isn't registered. ok.
2) The same message is showed 6 months later: I would change that message to a more explained message, telling the admin that, although the site is registered, it's recommended to update the info there.
3) When no registration renewal is needed, the button appears alone: I would add one message, telling the last-date of registration and that it can be refreshed at any moment.
Perhaps 1 & 2 should be displayed in a visually stronger way (they implies an action) while 3 is just to say that no further action is needed.
Just one idea!