Ok, thanks to an ancient thread from back in 2007 Ashley gave me the answer I was looking for:
69.24.73.172/scirra/forum/viewtopic.php
You want to make so that when the user clicks on the titlebar it sets a variable (like MoveWindow)to 1. And on left mouse button up, set it back to 0... That way the cursor can even leave the window area, and disengage the move function when the user releases the button.. This even works across multiple monitors :)
Here is a cheat-sheet for anyone interested:
docs.google.com/file/d/0B7p8-X5UMeryTDVkTU10dXdUUFk/edit