[Q] UNII-2 & UNII-2E channels Nexus 6 topic

I regularly setup wifi networks that use all 21 5GHz channels and I need to tune them for phone antennas. I've been trying to find a way to make my Nexus 6 use all the available 5GHz channels but so far I haven't found anything. It currently supports the UNII-1 and UNII-3 bands as well as the ISM channel but the UNII-2 and UNII-2E bands aren't visible to the device. As far as I can tell it isn't a limitation of the hardware but a software choice made by Google because scanning all 21 channels uses up too much battery.

So anyone know how to force the Nexus 6 to see the entire 5GHz band?