Button to hide/unhide completed tasks
See release 0.76.0.
I decided to add two toggle buttons to the toolbar of task viewers: one for showing/hiding completed tasks and one for showing/hiding inactive (future) tasks. You can download a preview (revision 2539 or newer) here: http://www.fraca7.net/TaskCoach-packages/latest_features.py
Good idea, and I would go further : put a drop list (or radio button) for filtering tasks. I often go from "today's tasks" to "this week tasks".
Mark Belsito commented
This is a good suggestion. I often find that my task list gets cluttered with completed tasks and having to select the filter to hide completed tasks is cumbersome (View -> Filter -> Hide Tasks That Are -> Completed). A toggle button would solve this issue and would make it easy to show completed tasks again if I need to re-activate an old task.