To clarify, here's a rough suggestion of how I would see shoulder buttons working:
It would be awkward, but not impossible. The point is that you can flip either side upside down to have the primary controls on top, whether they're buttons or slide-pads.
Yes, I'm aware that the flat rectangles I drew to quickly illustrate my concept look like flat rectangles. This isn't meant to be an ergonomically refined proposal, just a quick demonstration of how reversible controllers and back-lit buttons might operate.
The shoulder buttons wouldn't do anything while on the bottom (and it would be difficult to accidentally press them anyway if they're in slightly from the sides). The system would know which way up the controllers are and only enable the appropriate buttons.

If the display is really 6.2 inches like the earlier rumor claimed, it would be literally impossible to reach all of the buttons when the controller parts are attached to the main body, though.
Actually, even if the device was 3DS XL-sized, the distance between circle pad and buttons would be too big to use buttons and circle pads at the same time.
It would be awkward, but not impossible. The point is that you can flip either side upside down to have the primary controls on top, whether they're buttons or slide-pads.
Do everyone realize that most mockups looks uncomfortable?
It looks like this:
![]()
Flat and rectangle
Yes, I'm aware that the flat rectangles I drew to quickly illustrate my concept look like flat rectangles. This isn't meant to be an ergonomically refined proposal, just a quick demonstration of how reversible controllers and back-lit buttons might operate.
Shouder buttons on bottom and top is a waste of button inputs and prone to accidentally be touched in handheld mode.. The triggers on the wii controllers worked great. There should be a more clever solution for your mockup to work. I think asymmetric design is a better option and solves problems.
I agree with the IR though, didn't think of the motion pointing option.
The shoulder buttons wouldn't do anything while on the bottom (and it would be difficult to accidentally press them anyway if they're in slightly from the sides). The system would know which way up the controllers are and only enable the appropriate buttons.