I have lots of conversations with the Yuneec guys, and they basically tell me to not bother flying this indoors even with IPS. if you do you have to turn off GPS and its its touchy and you need lots of room blah, blah bla...
Basically, they made it sounds like it was not supported.
I honestly can't get it to fly outdoors with GPS, so I have not even bothered to try indoors - but after talking to the CS team, they really turned me off from even bothering to try.