I'd love it. Even if the graphics were crap, I wouldn't care.

As for unit organization: I think, similar to your idea, that you could have a base unit of say 100 men, and you could hitch them together with other units to form a larger unit that still look like 3 different units standing shoulder to shoulder, but move as one.

I'd also love it if your movements on the campaign map affected deplyment, and if you didn't start out seeing your opponent right away, but would only know the general direction he lies in.

Ideally, there'd be no map boundary, though I don't know how technically feasible that is.

I also think that'd it, as you said, would make battles much more realistic when the battle line is 30 men deep, not 3, and actually show why reserves were important. Hopefully, it'd also allow for mass attacking one flank of an enemy that doesn't know where you are, who has the rest of his force a ways away.

Best of luck to you!

Crazed Rabbit