You can reorder Subtasks:
It is possible to manually reorder subtasks via drag and drop. This is a feature for Pro Subscribers. To use this, you must first go into your account settings and under "Subtasks" enable manually sorting. Now, you can drag and drop subtasks into the order of your choosing and the sorting criteria discussed above will be ignored.
http://www.toodledo.com/info/help.php?sel=103
BTW, where did you get the quote from Toodledo support?