I just wanted to report that I have tried LMCE with the Gyration Remote.
The gyro stuff works out of the box. Only a few keys worked without a custom .Xmodmap. Once the keys were mapped to X11 key events using .Xmodmap, I had to configure individual applications to understand the keys (i.e. using the "Edit keys" MythTV plugin and the KDE setup program.)
Below is my xmodmap, the commented out lines represent keys that I could not get working, the channel up & down keys send events but they are not recognized by the regular HID driver; the driver could be patched for these. Ten keys (power, tv play icon, camera icon, tv icon, music icon, iPod icon, 'setup menu', last, input, and dvd menu) don't send any events, so you probably need the Fiire firmware for these to work. "Follow me" will of course not work with the Gyration remote.
PS you load this using "xmodmap ~/.Xmodmap" where ~/.Xmodmap contains the following:
!XF86PowerDown
keycode 177 = XF86AudioRecord
keycode 164 = XF86AudioStop
keycode 110 = XF86AudioPause
keycode 152 = XF86AudioRewind
keycode 179 = XF86AudioPlay
keycode 180 = XF86Forward
keycode 144 = XF86AudioPrev
keycode 153 = XF86AudioNext
!XF86Launch0
!XF86Launch1
keycode 234 = XF86Back
keycode 134 = XF86Launch2
keycode 176 = XF86AudioRaiseVolume
keycode 174 = XF86AudioLowerVolume
keycode 97 = XF86VendorHome
keycode 160 = XF86AudioMute
!keycode 240 = XF86RockerUp
!keycode 241 = XF86RockerDown
keycode 237 = XF86Launch3
!XF86Launch4
!XF86Launch5
!XF86Launch6
!XF86Clear ; already mapped to escape
!XF86Launch7
!XF86Launch8
!XF86Launch9
!XF86LaunchA