How can we improve WHMCS?

When creating a promo code for domains, there should be three checkboxes to specify which actions it applies to: registrations, transfers, renewals.

Our use case is to create promo codes that encourage clients to register new domains or transfer existing domains to us. In these cases, we specifically want to exclude renewals. At present, WHMCS applies promo codes to all domain actions, and there is no way to prevent their use on renewals.