In the wii GUI the controller will vibrate briefly when the cursor moves into a clickable area, so the user knows they can now click the button. With a touchscreen though, when the user taps in the clickable area, the click has already happened. There's no need to alert the user that they are in a clickable area. It might be good to alert the user that there was a click though. As you say, it should be something you can turn off.
Sound is better than vibration, you can use different tones. A vibration motor can't make much variation.
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