What I feel is that the power button should have been positioned somewhere towards the right-bottom - so that even if someone overload the power button function, it should feel as if we are using a dedicated camera button. But since the power button is located somewhere just above the right-center, I would be happy to continue using the on-screen capture button as it would be awkward to click a button located at an awkward place while taking snaps.

Thread for your reference: http://talk.maemo.org/showthread.php?t=85491