I can confirm it works with the USB to IR adapter. I got the kit shown in this link [Link: googletvforum.org]
I think only commands I couldn't get out of it were FF, REW, and the MENU button. The left and right arrows did work as FF/REW in the few apps I tried, just like Apple TV. The MENU key didn't seem to be that big of a deal- there is a HOME IR command that works similarly.
I made a Crestron IR driver for it if anyone wants it. It has the non-functioning commands listed above (left them as placeholders in case some IR data becomes available).