I agree with you, Tresclub. I don't necessarily expect the SPACEBAR to activate the shot; just give us an alternative keybard method for both releasing & setting up our shots, that's all. Any key will do. And, the SPACEBAR is such a large key that it may in fact be a bit slower to respond than a smaller key that you can hit perfectly and firmly every time.
That being said, I've tried hitting the ball with the SPACEBAR over at Tiger Woods Online in the last few days, and it worked reasonably well. But: there is no in-game chat window as yet in TWO, indeed no multi-player either, so the problem described by Tresclub will likely appear in the TWO world later on, wreaking potential havoc.