So, even on a pixel-packed Galaxy Nexus, you still can't get a "better look" at what's downrange until you shoot the image and then review the full-resolution result.
It'd be hugely valuable to have the entire bottom of the screen act as a trigger, so you can focus on what's downrange of the lens instead of how to direct your fingernail to land on the speck-of-a-button that'll trigger the shutter.
Though I was only able to meet a small sample of those who deployed downrange, it was important to me to look them in the eye one last time and let them know how much I care about them and appreciate what they and their families do for our country.