Whould be very handfull IMHO to be able to see unit engage distance, spotting distance and skill. I mean there should be some button so when you press it you have those values visualized in some kind of circles ( for engage distance ). For example if you place some static weapon on the hill you may check how far it may spot or engage targets. Or for AA soldiers - when you place some AA patrol then you may visually check how big area they cover for defence and so on.