I have been following this but feel the need to jump in now.
I took notice of how the Radar situation currently works, and how units react to it. If I order my units to do a Attack Move they will shoot at anything the Radar puts in range. Not all of it hits, but it does at least allow them to shoot towards the "signature" of the red blob in the non-visible range.
I like the current setup, perhaps a little adjustment to the coloring (perhaps a yellow to red range that doesn't get red so quick?)