Change the Due Date Color if Marked Complete and A Mark Complete Filter?

[EggofTreachery]

I use the date color options to give myself a quick reminder of how far away somthing is due (IE Blue if its due that day and Red if its overdue ECT.) And I would love to be able to make projects marked as done a specific color. A setting where I could just press the check box and have it go into a specific "mark as complete" column would also be nice, just for ease of use. Fantastic Plug-in!