Yes, I can confirm all these problems.
@Chris Barrett managed to simultaneously use a HDMI monitor plus C1 on another display, as I understand there are some settings that need to be tweaked in the camera menus. But I didn't find them, however I switched them back and forth.
Otherwise, the Live View in C1 is a lot better than what I have seen from Phase backs (you can't really compare them, Sony is way better) but I still would want more from Sony. In studio environment and with lens stopped down the feed is ok, but the details have still big room for improvement.
Indeed, you simply cannot rotate an image in portrait mode in C1 Live View. A lot of people asked on Phase forums to have at least a manual rotation option, but the guys from Phase replied that this is a problem from Sony SDK. HA HA HA. No kidding, Phase, so you cannot rotate a f*cking content of your program window...
For me, still, A7RII is still a lot better to use than my old P45+ and I don't regret the switch for a second, workflow or IQ wise.
In fact, I'll put a sale post soon. For P45+