Paul
I'd like to see a way of slowing cars down
How about the ability to order a lift & coast scenario? A driver could be ordered to save fuel via a Save Fuel button, that way, they'd lift & Coast, lap slower and also (because it would be programed in) they'd hold back, coming into the DRS zone if they were within, say 0.3 seconds.
The beauty of having a FS button is that if you've underfuelled, you can hit FS and get to the finish without needing to stop. You might lose a place but it's better than losing numerous places by stopping for fuel an extra time.
Great idea!