In my opinion it's OK just the way it is now...Encrypting all the radio traffic in SH world would be too much really and not even realistic.
I have already encrypted a numbers of campaign radio communications up to 1942. For now, the idea is not to force the player to decipher occasional encrypted communications, but doing so player will make his "life" at least a bit easier and patrol more interesting...
Optional addon for grid reposition combat order would also be cool , IF you can come up with solution for mentioned in game current year problem...
