Maximum number of callers allowed in queue needs 2, 3, or 4 Merged

We converted our telephone systems from 2 line hunt group over to a call queue with four Users.

Only 2 of the 4 queue members are on shift at any time. A maximum of 2 queue callers can be accommodated simultaneously. Ever.

We would like to have an option to set the "maximum number of callers allowed in queue" as 2 rather than 5.

Thanks