I've read enough "clear image zoom" threads over at DPR to know that not everyone, including me, considers the zoom button a waste. However, I do agree that it would be ideal if it could be user-assigned for those who wish to do so.
Totally agree on the ? button, which on my A57 only gets pressed by accident.
The button I miss the most from my A700 (besides the handy exposure mode dial) is the C button, which I used for quick access to flash exposure compensation. I also miss the convenience of having an on-off stabilization switch.