The frustration is all of the chording for things that seem to merit their own key in my world. Fn-up, down, left, right could better handle screen and keyboard lighting, and put page up/down/left/right up there instead. I mean, the freaking computer controls the brightness anyway, why even bother with single touch? And play/pause and fast forward/reverse?

Home and end don't bother me as much as page up/down, really. I hate finding my place again after scrolling up and down, and option-up/down is annoying to me.