Rotate ES without config change and reboot?

[Jouster]

I have a manually-rotated CRT system. I've grouped my games into ES Collections based on screen orientation. I pick either a vertical or horizontal collection, rotate the monitor to the appropriate orientation, and then play games from that collection. Ideally I'd like to be able to pick a menu option or hit a button combination to have ES then switch to the appropriate orientation so I can easily scroll through the games without turning my head sideways. I know about the startup parameter that can be passed to emulationstation, but this doesn't really help for a rotating monitor setup. Any suggestions would be appreciated!

[Jouster]

I solved my own problem! I modified the EmulationStation startup script to toggle back and forth between horizontal and vertical mode on a restart. So, now I can rotate my monitor, restart EmulationStation, and my menus match the orientation. Here is the updated file:

/opt/retropie/supplementary/emulationstation/emulationstation.sh

#!/bin/sh
esdir="$(dirname $0)"
while true; do
   rm -f /tmp/es-restart /tmp/es-sysrestart /tmp/es-shutdown
   "$esdir/emulationstation" "$@" $rotate
   ret=$?
   if [ -f /tmp/es-restart ]; then
     if [ -z "$rotate" ]
     then
          rotate=”--screenrotate 1”          
     else
          rotate=””
     fi
     continue
   fi
   if [ -f /tmp/es-sysrestart ]; then
        rm -f /tmp/es-sysrestart
	sudo reboot
	break
   fi
   if [ -f /tmp/es-shutdown ]; then
        rm -f /tmp/es-shutdown
        sudo poweroff
        break
   fi
   break
done
exit $ret