most of our invoices are physically mailed to customers. following printing, I have to remember to drop down the "more" menu and select "mark as sent" otherwise, and I've done this, I'll resend an invoice by accident. would like to be able to know that I've printed an invoice, and would be nice to be prompted to "mark as sent" every time I print out an invoice. This all happens automatically if you email an invoice, would like the same features to snail mailed invoices.