Pending e-mails (similar to todo/star)
When I send an e-mail that needs reply I currently star it so I don't forget it. This allows me to archive. I could use the todo option instead, but don't want to clutter up my todos with these. The ideal option would be to have a pending category that works like the todos do
Can you not just use the 'Bell' in the compose window to 'Remind me if noone replies'? This moves the email back to your inbox ona certain date if it hasn't received a response.