It'd be helpful to be able to left-click in the Invoices screen on an invoice that is coming due or overdue and send a 'gentle reminder' email to a client. I personally am not quite comfortable with letting the automated processes take over (have disabled auto invoicing because the first time I set it up - last week! - it generated invoices for clients who owed nothing, which in turn generated work for me deleting them all and resetting the 'next invoice number') and, at the moment, I have to keep switching back and forth between contact records and invoice records to handle them all one at a time, instead of being able to work my way down the list of unpaid items on the Invoices screen.
:o)