[MlMt] due dates?

[Eric Sharakan]

So one thing I truly miss from using Mail.app (when combined with the 
MailTags plugin from Smallcubed) was the ability to set a tickle/due 
date on a message, along with smart mailboxes to show me which messages 
are coming due, which are due today, and which are overdue.  It also 
included the capability to control the shade of color on the one-line 
message preview based on how soon the message was coming due.

Is there any way to replicate any if that functionality with MM (perhaps 
with tags and smart mailbox rules that can parse tags as dates)?  Has 
anyone tried to do this?

Alternatively, has any thought been given to implement something along 
those lines?

Thanks.

-Eric