I use a trackball for my laptop and desktop PC for over 20 years now and highly recommend it. I have one with the ball with the ball under the thumb instead of the middle like this one has though.
It works not just for light gaming, but also "heavy" gaming, like shooters. Just move your thumb instead of your whole arm. Works perfectly well.
And that's not even mentioning how relaxing it is. You can put the trackball anywhere. I like to stretch my arms sometimes and put the trackball away from me or lean back and put it on my lap. It works on any surface.