Is there a hotkey that shows the command radius of a particular HQ? I don't mean the diminishing returns, but just the max distance a HQ has influence. If not, is that something that would have an interest in any future patches.
The radius in on the HQ screen, up near the name of the HQ.
And the radius can have different meanings for different purposes. An Air HQ with Command Radius 5 can actually support some actions at bases up to 10 hexes away. For my preferences, I think the screen would get too cluttered having all the various rings in play.