Hi Slin,
Well, it seems like you've done your research. Correct, it doesn't have tracked controllers, but your eyes can lock onto things... so you could have it so that your eyes lock on to the ball, then you press a button on the controller to swing the racket - but yeah... it probably wouldn't be the same experience...
Think you can think out of the box for this one? If not, we can always go with it as is - and just promote it through the other areas I have planned. Can you contact me at contact@mugen-creations.com so we can discuss this a bit more?
Thanks!