Hi...in my case the ones I've tried are power on/off, volume, and brightness. They all worked without a hitch. I don't know about any of the others.
The one thing I can't figure out is if there's a way to disable the fullscreen OSD background that fades everything when setting volume and brightness via the EX-Link port. I'm using my TV as a PC monitor, so I want these things to be as invisible as possible except for the result.