I would second some use for a second monitor, not a lot of games do this.  Some do.  I think supreme commander did, iirc, and battlefield 4, etc... 

Obviously it should just be used as something informational so that those w/out dual monitors don't feel like they are missing anything.  But one less screen I have to open up because its already open on my second monitor would always be nice. 

Maybe a convenience screen w/a bunch of things I can quick jump to w/a click, like a list of planets/ships/control points, whatever, just always open on the second monitor for a quick click-to-jump-main-screen-focus selection. 

Or even just a place to put every screen you open leaving the main screen to always be the main map and never to be covered by these other screens as it is normally.  E.g. - open the tech screen and it displays on the second monitor instead of covering things on the main monitor. 

Lots of choices really, and any use at all would make it one of the few games using this feature - making it a nice selling point.