Left-handed? Well, he already suggested that it could be detachable. Some of us prefer mice... and frankly, I don't think the trackpad will work well for first-person-shooter gaming. :)
So if it's detachable, make it symmetrical; it can plug in the left side or the right. Gives you a spare USB connection, too. Bonus!
Behold, the Revolutionary Apple Wireless Touchboard Concept