[otrs] Deactivate option within Frontend

Hi, can anyone answer or point me to the correct direction if its possible to deactivate the displaying of options within one Frontend (like Frontend::Agent::Ticket::ViewPhoneNew) ? I can use the Frontend::Agent::ModuleRegistration for restricting modules and I can restrict the option values with ACLs. But right now I haven?t found a way to "not display" one option within one frontend for a special group (for example group1 shouldn?t see the SLA option within ticket creation). regards Christoph Ohliger