Do others have issue/solution for obsolete Authorized for Employee Expense

We are exploring the possibility of automating the removal of obsolete User IDs that are Authorized for Emplolyee Expense (Travel and Expenses > Manage Expenses Security > Authorize Expense Users)
Example - employee changed roles, has a new manager but, the old manager remains as authorized to enter expense reports on behalf of the former employee
Have others done this?
Do others have a problem with the current state that new managers are automatically added but old managers remain?