I'll begin.
I would like him to pass the ball incisively from time to time, to a player on our team, not sideways 5 yards but forwards. I'd like him to do some extra training on sprinting practice, so that he doesn't look so one-paced. I'd also like it if he could improve his set-piece delivery too.
Now, you may or may not agree with what I've said, however, that's what 'I' would want.