It would be AMAZING to be able to create a workflow that allows you to move a Deals stage automatically after an email has been sent to the associated contact. This is possible with Tickets, where the Ticket can move status if you send an email/the Contact replies, however, it is not possible with Deals.
This would allow us to automate more of the Sales process in a Deal pipeline. E.g: The Deal could move from 'Quote Created' to 'Quote Sent' if we had this type of property/automation.