I suppose you could make it like PR where only the commander sees the the scout plane radar and he then marks the positions on the mini-map.
That's the only plausible way of making it work in this engine AFAIK.
But there's a very old thing people tend to forget about... The scout plane IS a commander vehicle! You can spot and mark, and call arty and all the fancy stuff from it (the second seat).
The only problem is that you need a buddy to fly it for you. And that's sometimes much harder to "implement"