I managed to get this to work with the maverick kernel by catting "rc6" rather than "rc-6" to /sys/class/rc/rc0/protocols.
echo rc6 | sudo tee /sys/class/rc/rc0/protocols
This combined with
sudo ir-keytable -p rc6 -w /etc/rc_keymaps/imon_mce
Got it working for me.
I put this in rc.local for now, but there is a chance the modules may not have loaded when rc.local is run, so I've forced a modprobe for now. Once this is all in udev it should be much cleaner.
My rc.local looks like this:
ir-keytable -p rc6 -w /etc/rc_keymaps/imon_mce
echo rc6 > /sys/class/rc/rc0/protocols