I would very appreciate the new feature:
The category of a task could be changed by a user under these conditions:
a/ Both categories use the same workflow
b/ Category relation rules allow the new category to be contained in the task's parent
We need quite often to change a task's category eg. from Bug to Request, or from Request to ToDo as the task's history evolves and we want to keep the meaning of the categories. This feature would be nice for us.
