There are times that a task in a BPMN flow is useful in another as well. Of course one could introduce a reusable process containing that task, but then the 'call' of that reusable process has to be configured (I mean: setting all properties for it) for each use.  

Instead, I think it would be very usefull to be able to copy/past a task from one proces into another.All properties of the copy should be copied as well from the original.