All of these ideas are great, and I would LOVE to see Tripwire launch with a special edition, but everything I've heard seems to suggest they're too busy with actually making the game to be bothered with stuff like this.
Regardless, I'll add my two cents

Separate versions is a great idea; a Zeltbahn/Plash Palatka, or a simple cloth field cap would be great options, and probably not
too expensive. A "combat phrasebook" is a fantastic idea (both Russian and German in one book, of course), as is a map with information about the battles represented in the game.