I don't think it is either. What we have done in the past to get the bedroom cooled down is to close all the other vents and use the air dump feature, as well as put a small fan on the floor pointed in that direction. It got cold FAST. Then we just switched everything back to normal. I suspect at night it will have no problems keeping the unit pretty cool. I have full paint and the dark paint doesn't help much with minimizing direct solar gain.
There is 12v power at the vent for the FF so you might be able to snake a cable back down the chase using them as a guide. Not sure which way they run. The AC in the bedroom mod isn't on my list.