Hello,
Yes, ultimately I plan to expand through the British and Russians, and possibly the Japanese(though they would be tricky because at this time I have no direct source of Japanese soldier images to use, but it could still be done). I doubt I would go beyond these sides because the main units are so similar(American/British/Russian units are generally like the French and other European nations). The exception might be China, because it would be interesting to have a WW2 showdown between them and Japan. Some of this would be quite down the road though(months, at least).
Another idea I have is for land mines. They would have only one map move(not 0 for practical reasons, the excuse would be that a nations engineers could simply relocate them), but would be immobile in battles. The idea would be to place them as far towards the enemy as possible and let them run over them. Their attack would be set up to wipe out the entire square they are in(plus them, of course). I have not worked out yet if an engineer unit would be able to stop them. Maybe if the mine is ethereal and the engineer's mine sweeper in set as a magic weapon. This would be cool, strategic, but tricky to work out. Would be worth it though.
The way I plan to make paratroopers is also neat. They will have a map move of 3-5 or more. This would simulate transport planes(wether C-47 or Ju-88) carrying them between turns, "dropping" them in that far away place or even in territory not connected to a player's currently held province. Needless to say this would provide realistic and diverse tactical options to both sides. Each airborne officer would represent one plane and his leadership value its carrying capacity(likely limited to 10, more than that would lose realism and make paratroopers too good). It would just mean that more leaders(planes) would be needed for major drops.
In adition to mines, I have some ideas for other map move one, but immobile units. These might include: bunkers, MG and sniper nests, AT guns, very heavy stationary artillery(lol, makes me think of the huge German rail-moved guns), and others. I also have one very crazy idea: to create a V1 or V2 unit which would be able to fly over to the enemy's initial consentration in a battle and unleash a huge kamikaze attack on them(simulating launching the missile and it then exploding on the enemy. If it were destroyed before it could attack it would simulate it being shot down(like many of the real V-weapons). Just a cool thought.
This is just a major brainstorm, not a promise to have such things sometime. Anyway, anyone can feel free to add or condemn ideas.
