Well that's an interesting question, I part wrote it.
It is intended to let you play a game with far less figures than you might need for other rules. If you have picked up a few packs of Perry at a show because you just like them (my hessian and northern militia....) or have just won some figures in on eBay and have say 19 foot, 6 horse and a gun, well that's an army.
It's aimed at getting figures on the table and having fun. Put it this way, I have some Prussian volunteer jäger; they count as 6 skirmishing, vengeful infantry. Meanwhile my French hussars may be veteran and dashing. And yes, those British could be veteran scum (they will fight hard but if there's a chance of loot or free grog, don't let them out of your sight).
I think Ivan put the beta version on wargames vault for the curious....