We understand that you might need more - but that page is already too full with options.
In the meantime open an ideas request and we will check it.
But I think you need to use custom templates for this one.. At least the development required is minor because in the last 6 months, from the analytics we have and the features we added in the provisioning area, a whopping 82% of customers that were using custom templates stopped using them. So the improvements we made were a very big success.
Add it - MAYBE with a bit of luck, some day i can have you using the 3CX stock Template
(I doubt it but we will see)