Allow afterthought "Email after run (with/without errors)" after Gallery execution

[seven]

When I manually execute a wf on Gallery, I sometimes have a tinge of regret that I don't have email events set for the workflow. In most cases, it's just THIS time that I want to receive an alert and not every time. At any point while the workflow is executing, allow the option to request an email event to be sent out for this execution.