I want to use task colors to get an idea about modification activity on the tasks. I am thinking about
* modified or moved within the last 24 hours: intensity of task color 100%
* modified or moved within the last three days: intensity of task color 80%
* modified or moved within the last week: intensity of task color 60%
* modified or moved within the last month: intensity of task color 40%
* not modified or moved within 6 month: set color to <new color>
An automatic action to set color intensity based on advanced search functions like createdRange, updatedRange, modifiedRange, movedRange with due might be a way.
Is there already a way, to accomplish this or a similar thing?