Sounds a bit more like what games such as ArmA do in their scenario editors. It doesn't take that long to build a few squads and a platoon HQ in that, with whatever mix of weaponry/soldiers you like.
However, that approach only really works for small amounts of units, and it also relies on the scenario builder knowing the ins and outs of every single formation they want to use. You also lose out on the automatic links between HQs, so the soldier wouldn't recognise he is part of 3rd squad, 2nd platoon, B company, or whatever. That makes the whole C2 simulation pretty much irrelevant.
While it'd be nice to tinker around with the formations now and again for one particular scenario, I think I much prefer the top down approach BFC use
Now, if TOEs were editable/moddable, that would be a different story