Hey DK,
Thanks for reaching out to the SmarterTools community.
I can see this as a useful feature. We already have a notification pop up when you type "attachment" into an email and try to send it without adding an attachment. So I can see this as a good addition to that.
I will go ahead and submit this as a feature request.
Kind Regards,
Zach Sylvester
Software Developer
SmarterTools Inc.
www.smartertools.com