Starcraft – How to switch applications in mac osx when in starcraft 2

Sadly there is no method by which you can prevent being matched with another player without breaking ToU, however Team Killing is a form of harassment and can get you banned if reported. I would suggest you contact blizzard support as soon as possible.

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For detailed information on how to contact Account Administration visit the Account Administration page.

For assistance with StarCraft II in other regions such as Europe, Korea, or China, please refer to our International Support Contact page.

For Starcraft II specifically there's actually an in-game option to disable windows key and/or alt-tab. It's under "Gameplay" the 2nd and 3rd last options.

Also for SC2 if you set the graphics setting to "Windowed (Fullscreen)" it will let you instant-alt-tab. It says it may cause a drop in performance but I personally haven't noticed it and the ability to alt-tab instantly is worth any small performance drop unless you're on a really low end system. (I browse the web when searching for matches, and just have "Play in background" turned on for the sound so I can hear when one is found).