Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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You might be in luck... what follows is based on the assumption that 'MCR Remote' is compatible with the remote you have;
Go to Web Admin and Wizard -> Devices -> Media Directors
No find the green 'Add Remote' button for your Core/Hybrid and click it. In the window that appears select 'Gyration' from the Manufacturer pop-up then click 'Apply Filter'. Now select 'MCR Remote' from the Device Template pop-up and the click the green 'Pick Device Template' button and then close the Window. That should have added an 'MCR Remote' to you Hybrid. Your Gyration usb IR receiver should get auto-detected I think.
Now do a reload router and test your remote in the Orbiter... it should be working. If not try rebooting the Core/Hybrid and trying the remote again.
Hope this helps... and saves you the effort of adding a remote from scratch.
The standard Gyration remote is not one of the standard remotes that has a template in lmce. The Gyro mouse functionality will probably work but not the additional remote buttons. You'd have to add a template yourself.