I just got my backer-Ouya on wednesday. (problems with custom office in germany )
After I booted it up I started testing it with a friend of mine. The first thing he said while looking on available apps:
"Wow, you can stream to Twitch with it?"
He was a bit disappointed that the twitch app is only a player
Ouya Devs, official Ouya team, what do you think about integrating direct twitch support into the firmware of the console?
So it might be possible to add another system account for twitch (beside the one for ouya) and activate Twitch in the start screen to start streaming.