Regarding usernotes... I checked the permissions and you're actually not able to manage them -- nor are the members. As to why it shows a link even though you're not allowed to, I don't really know. Supermoderators also
weren't allowed to manage them, but I changed that. Formerly only Administrators could, but now the supermods can manage them as well. On that note, if any users notice abuse of their usernotes, you should contact any of the supermods or admins so the issue may be resolved. Usernotes are still subject to forum rules.
edit:
Regarding "Visitor Messages:" I checked permissions on those as well. I don't necessarily disagree with the ability to remove them for all groups. If someone writes something foul, you should be able to remove it from your profile immediately, as they're on your main profile page for everyone's immediate viewing.
Those are the permissions for the "Registered Members" usergroup -- it is identical for all usergroups, and I'm okay with this. It DOESN'T allow you to edit other peoples' messages on other peoples' profiles -- only your messages on others' profiles, and any of the ones posted to your profile. If anyone objects, I should be told soon, albeit via PM as to keep this thread more directed to any other issues/questions/etcetera people have.