Nice idea. I'd use that.

I've always liked this concept, which comes up often. Many people desire drag-and-drop organization of due dates and the like. One way to accomplish this, that would save RTM from reinventing the wheel of a whole calendar, would be to enable two-way CalDAV syncing, so that one could review one's tasks in iCal, organize them there, and have those changes reflected on the RTM site. There's a thread here with over 125b requests for this idea: http://www.rememberthemilk.com/forums/ideas/1673/

This is a very late reply (sorry!) but I made something like this - to let me organise my RTM tasks using drag-and-drop on a calendar. For people who come to this thread late like me, it might be useful

http://dalelane.github.io/rtmscheduler

wow, this is amazing. thanks.