Allow filtering by "Is Subtask"
Toodledo allows you to search or filter using a True or False "Is Subtask" criterion. I would like to use this with UTL.
This is useful:
1) To filter out subtasks to that one is left only with top-level tasks, giving you a list of your GTD "projects". (This is similar to, but slightly different from, using the "Has Subtasks" filter, as in this suggestion: http://utl.uservoice.com/forums/149475-new-feature-suggestions/suggestions/2615558-has-subtasks-filter-criteria).
2) To create lists that include next-actions for your projects (again, where a "project" is a GTD task with subtasks.
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Daniel McCune commented
In addition, you would need to display sub tasks without the parent task.