Selecting keys in Graph Editor from different channels at same time and value? Is it possible in the Graph Editor to select keyframes from different channels that are stacked on the same time and value? I have tried box select, various shift-select combinations, the k and alt-k hotkeys for column select etc. without success. It doesn't matter if I have all my channels selected, I can only select a single key. This is really a problem for my workflow-- but perhaps I am missing something obvious.

On the left I've made all 3 channels active-- on the right after box select only one channel and key have been selected.

Thanks
Answering my own question: I finally realized that I was clicking again on the key to move it-- which deselected the other channels. Need to click-drag away from the keys to move them together. 

BUT... when multiple keys are selected the numeric boxes disappear from the properties panel! Is there a way to assign a single numeric value to multiple keys?