Yeah, I'd probably do the same. Had to ask, though.
I was just examining the Readius version yesterday and noticed that the buttons all seem to have specific names for their nodes. I was curious as to whether the naming was what controlled their functions.
From what I've figured out, some of the duplicates are for things like alpha and light maps -- The duplicates of buttons, for example, are so that they'll light up when selected and so on. It's likely that everything is attached to seperate bones of a skeleton.
It's difficult to know for sure though. It's interesting how you can click the buttons with your mouse on the Readius despite them being in a different location than on the original Pip-Boy 3000.