Editing OMP & TT for OATH when General Settings: Use and enforce customer prefix

[JohnSalter]

When "Use and enforce customer prefix" is set in the "General Settings", the OMP and TT become un-editable in the OATH Advanced config page. This does not make sense to me. Maybe include OMP & TT as optional global settings together with those for Yubico OTP? Or always allow editing of OMP and TT in the OATH page irrespective of this check box.