How can we improve WHMCS?

It would be good if we had an option inside each invoice to exclude from Late Fees.

We often have clients who will have invoices that need to be excluded from having a late fee added, but without changing the global setting for that client. We still want their other invoices to get late fees added (eg: their monthly services).

Or perhaps have a setting in the invoice to override the global client Late Fee setting with its own selection (Yes, No, Use Client Setting).

This would allow us to even have the opposite scenario where you want a client who doesn't get late fees (Late Fees setting is off) on any of their invoices except for one or two exception invoices (This invoice has Late Fees ON - overriding the client setting).

Hope that makes sense. I've attached a mockup for where this might go.