You have to think about ergonomics. The fact is, it is designed to fit in your hand and be gripped.
If there were a few more buttons where would you fit them ???
You have to have enough space between buttons so that you don't inadvertantly bump them whilst simply gripping the wiimote, yet all of the buttons still have to be within reaching distance of your thumb and fingers.
This design simply does not account for anything more complicated than pure simplicity.
I think it's good the way it is, you have places to grip and you don't bump buttons by accident.
:big_boss: