One of the last things that Jon Armstrong worked on was decoding my IR Keyboard and Mouse. We spent an entire saturday afternoon on the phone decoding the mouse signals with the dedidicated help of John Fine as well.
I have since put together a rather simply directional mouse screen on an RC5000i that I have not yet converted for my 7000.
The keyboard/mouse combination is model ACK570 and I use it for my home-brew media pc. If anyone is interested, I'd be willing to share the mouse CCF. Just email me.