Harmony Smart Control works with it because it supports Bluetooth. Also someone else was saying it was responding to their sky remote, so might be worth investigating!
OK, since no one else seemed to care I've had to try Limelight myself!
Got mine last night and the first thing I did was sideboard it. It works amazingly! I'm actually able to play Watchdogs over WiFi with it! Girlfriend and I completed a episode of Wolf Among Us in bed while the PC streamed it from upstairs.
It's not perfect, limelight supports mouse emulation with a touch screen on other android device but we're screwed at the moment - so uPlay based games will likely require some intervention. Apart from that if you've got an Nvidia card then there's no reason not to get this installed!
Download the Limelight APK here (I used non root version) https://github.com/limelight-stream/limelight-android/releases
How to sideload here: http://www.aftvnews.com/how-to-sideload-apps-to-your-amazon-fire-tv-using-a-windows-pc/
I'm interested in doing some more reading about limelight ever since I saw that video of the chap playing games on his Nexus tablet!
My one question really is what kind of games have you been playing through it and what is the lag like? I know this doesn't really matter much for things like RPG's etc but my main use for it would be when mates come round and we want to play Fifa in the living room instead of being huddled in study around a pc. Any chance you've tried Fifa?