Well Im no rocket scientist, but if I had a TRP coordinates, and all I wanted to do was move it a liitle from there , I think I could figure it out, even if I didnt have LOS. And when they send the shells over, and I hear them dropping half a mile to the east I think I would know my math was wrong, and would call it off, instead of wasting all the ammo. Seems that the AI is giving the player the reins in this case, but decides to think for the player in other situations.
And come on, your telling me you sat down and read the manual 3 times before playing. You would be no fun at xmas morning!