So, you want a keyboard shortcut to resize the window, eh? Here's the Applescript to do it. I bound this to opt-cmd-M through Butler.
tell application "System Events"
if UI elements enabled then
set FrontApplication to (get name of every process whose frontmost is true) as string
tell process FrontApplication
click button 2 of window 1
--button 2 is the green "zoom" button for all applications
--window 1 is always the frontmost window.
tell application "System Preferences"
set current pane to pane "com.apple.preference.universalaccess"
display dialog "UI element scripting is not enabled. Check 'Enable access for assistive devices'"
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