A staff-user can't manage the own account (i.e. change password) over the menu "my account" on the right. The answer is "now access rights". If I add the right to mange accounts the menu works for this user. But then user can also change other users too, what I don't want.
I think we miss some information here. IIRC the problem is linked to permissions. They can only access their own account if they have the edit_* permission? So we should either not show the link, or make sure we have some way to view the information. I don't think we should allow to change their own information apart from password, as this would mean they could change settings they maybe should not be allowed to (patron category, library, etc.).