It is unfortunate to hear that your experience with our support team was not good. I have been looking at your case to identify what could be better there so hopefully we can make sure to get you the info you need in a better manner next time.
The function for SPACEBAR+click to start the audition playback does work on both Mac and Windows platforms. However, there are some details to to be aware with this action.
On Mac, the Playback Controls palette must be closed first or this will to work. If the palette is open, pressing SPACEBAR will start playback normally and holding it will start a continuous pause/play loop while the button is down. When the palette is closed though, you will get different behavior, and playback will wait for the click to start. Not necessarily very intuitive, but it does work.
On Windows, there can be some difficulty with hardware constraints on laptops that will prevent this from working properly. In particular, there are settings that will prevent the touchpad from responding while a keyboard key is pressed. This is in-place to prevent accidentally pressing buttons on the touchpad as you type. There are ways to disable this behavior which vary depending on the laptop being used. We have one way of disabling this listed in our knowledge base article here. I hope this helps.