> I may have a Fn-key that works as stop/start, but unless I already know what's going on, I don't know what impact pressing the key will have.

Someone in a related thread said the app-specific keys are only available when the app has focus, so wouldn't you have the status of the app in front of you anyway?

In any case, I found the statement funny, because touch is flakey for me, so I never know what impact pressing a touch key will have.