Administrator notes: Entries made by each admin, visible to all admins

[Caiman]

Currently as far as I know, the 'Administrator notes' section on the admin CP home page only displays notes left by an admin to the admin that made them.

I'd like to make that a kind of 'Admin noticeboard', so if I add a note to it, other admins can see it and vice versa. Describing it sounds simple, but is this something someone could try, or already exists? Thanks.