Todooo for todo.txt

In my opinion this is the best iOS Todo.txt app, so I’m writing this to ask for some additional features. 1) Could there be a filter for “not”? There’s already filters for priorities, contexts, and projects, but it would be nice to be able to find tasks that don’t have a project or don’t have a priority. 2) Minor UX complaint: the settings are hard to find. You’d think you could find them when you’re viewing the list of filters, so it’s odd because you have to select a view to see the gear icon. 3) There seems to be a small bug where if you add a task on the “today” view, the due date cannot be removed, even in other views. I had to use a different app to remove an unwanted due date. Thanks!