I love subtasks!
However, I want my subtasks to remain in a certain order. I do this now by numbering each subtask and then sorting alphabetically.
I think a great feature would be numbered subtasks - HiTask would number them 1…n and the alphabetic sort (or a new numbered sort option) would simply sort by the number of the subtask. If the user changes the order (via drag-n-drop) the tasks would be renumbered accordingly.
Thanks for a great product!