How can we improve WHMCS?

I would like to see another tab on the quotes and invoices admin screen to show which invoices are linked to which quotes and vice versa:
Quotes tab - "Related Invoices" - would show all invoices generated from this quote as well as have a button to "Link to an invoice". You would be able to click on the invoice number and go straight to the invoice to look at it. When you generate an invoice for the quote, all generated invoices would automatically be added to the tab.
Invoices tab - the same concept, "Related Quotes" would show any quotes that were used in the generation of the invoice or that were related.