Carpal Tunnel isn't really caused by pressing a lot of buttons alone (although if you used to type like you're trying to kill a small animal like me, you can definitely get pain in your hands doing that alone). It's caused by poor hand positioning relative to the keyboard among some other things.
http://www.webmd.com/pain-management...topic-overview
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Making the same hand movements over and over, especially if the wrist is bent down (your hands lower than your wrists), or making the same wrist movements over and over.
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So your wrist positioning is more critical than how many buttons you press.