Consider adding shortcuts to Graph Builder to enable fast plotting for keyboard users --
E.g. suppose I have speed and distance versus time, and I'd like to plot distance vs. time colored on speed, I could click on the "distance" variable, then press "y", the "time" variable and press "x", then "speed" and press "c".
This would be a check-able option under the red-triangle, whether these shortcuts are active, or the default of simply switching to a variable starting with that character.
Another option would be to allow capital letters to drop the variable into the drop zones, so the user could type "dYtXsC" and create the plot above very quickly.
Possible mappings: x = x-axis, y = y-axis, h = horizontal groupings, v = vertical groupings, w = wrap, o = overlay, c = color, s = size, i = interval, f = freq, p = page, m = map shape