@afewbugs Ok, I see you have some clear understanding in mind how it should work.
What should happen if a task is not done in time? Duplication or "nothing"?
What happens if you change the tasks details (title, description, progress, time, reminder) while the task is still active (not yet done)? What happens if it is already done? Is the task even there after being done?
You should be able to formulate a clear feature request to see if it gets some traction.
Chris

@afewbugs The question is not just the implementation: If you mark a task as done or set the progress, what do you expect with recurring tasks? Reset to zero? Should the already started task be thrown away/removed and started from scratch? How to handle updates of other data?
Just my 50ct. PS: I am considering starting an app that might fit your need but this is a different story.