Design a special keyboard programming layout not otherwise referenced. Select this layout in the operator privileges for you as Enhanced Layout. As soon as you log in with a corresponding key (or PIN, etc.) you are then in this layout. You can then switch from the layout to the normal cashier mode with a layout change.

Another method is to check the manager status of cash register functions, which can then also be used on the normal cash register interface.

Yes, you should even use templates for each different group of operators, as this is clearer and therefore safer. Explains security and options in the area of Creating a template for operator permissions.