"...and she doesn't tell the Doctor what she's doing, because that would just take too long and it's easier to let him do what he wants and clean up after him..."

This makes me feel much better about this scene. I was sort of worried because, well, to me it seemed like River was ego-inflating, you know, damping down her own awesome flying skills so that the Doctor wouldn't feel inferior and I had had an issue with that. I like this version, with the Doctor knowing he's misusing the control and River not wanting to go through the hassle of explaining, much better.

*adopts these motivations into personal canon*