"Jack
It's in limbo at the moment. It was buggy and several testers saw no need for it, so it was disabled and going to be deleted until I stepped in to keep it. My view is that as long as there are circumstances where you might want to use it, it's worth keeping.
For example, let's say if you have one of your drivers behind the other in a queue of cars, and you want the car behind to pass the one in front (e.g. to get objectives money). You could take control of DRS and only activate it on the second car in order to ensure a clean pass.
Just implement a button "let pass", where the driver would let the one behind him by. Thats much more senseful for a case like that in my opinion.
And thats what I would tell my driver as a manager anyway, if I would do something like that: "Let him by" and not "Do not use your DRS, so you can't overtake the one in front of you to let the one behind go by". Thats pointless.