Yes, see this page:
http://code.google.com/p/atv-bootloader/wiki/UpdateIRDriver
Make sure you do NOT pair your apple remote with AppleTV, if it is
paired, unpair it using AppleTV.
Then you record the 6 buttons, and:
... Then increment the UID by pressing "Menu" and "Play/Pause" for 5
seconds.
Now you can record another 6 buttons.
Repeat and rinse until you have enough codes recorded.
Pain in the butt, but you only do it once.
I highly recommend recording more than you will want.
HTH,
Dave