Question on Command Range shading

[typhoon]

I use the shade option quite often espesially to see how far a unit can move ect. I also use shade to see how far an artillery piece can fire by ticking the maximum range selection.
The question I have is that the command range and maximum range always shade the same number of hexes when an HQ is selected. As I understand things then the Maximum range is for use with guns but if it also works for HQ's then I can see no purpose for the command range to be ticked the maximum range selection serves for both guns and HQ's. Could be I'm missing something that I do not understand about the shading on Command range and sorry if this question is hard to read hope you understand what I'm getting at.