I’ve made a simple app that makes it possible to keep reliable records of the status change of tasks. It uses buttons to change the workflow state, which is otherwise a read-only field.
Timestamps are updated when a button is pressed, and a formula field is used to determine the length of time (in days) that the task has been in the current state - this might be useful to ensure that any tasks that are ‘lingering’ get prioritised.
Hope it might be useful/inspirational to someone 
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Nice, thank you!
How did you make it readonly?
The action buttons each contain a script that sets it as writable, updates it, and then sets it as read-only.
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