The boat has probably already sailed on this, but in case not .....
I like the idea of aiming only with the arrow keys. But, most people are used to some type of pole/stick thingy, so how about the range of the pole/stick thingy is limited in the higher levels. For instance, Beginner and Hacker could perhaps use that to aim at any distance. Amateur level would limit the range of the pole/stick thingy to 100 yards from the ball, Pro would see a limit of say 25 yards in front of the ball and TourPro would have it limited to 1 yard (or less).
The discussion about extra length or benefits from the higher levels reminds me of discussions on naming of the playing levels in early access. We have to remember that the game level does not describe the ability of the player's skills in the game, but the difficulty (or forgiveness levels) that faces the player in using their chosen control method.