Can we hide some party roles from the Account Team tab

Hi,

We currently have about 6 party roles in the fine tuning definition with the "Responsibility Role" checkbox ticked.  These 6 roles are available under the Accounts "Account Team" tab to add party roles etc.  On our system we only want to use 3 of these but there doesn't seem to be a way to deactivate these.  Does anyone know how I can hide the party roles we do not use or deactivate them?  In the party role definition in fine tuning the responsibility role checkbox is greyed out.

Any help would be much appreciated.

Regards

Jo