There is a thread on BBG that includes a response from Richard Borg indicating that a Napoleonic version was possible - but that was some time ago and Richard gave no details.
It seems to me that a system that copes with ancients, ACW and WWII plus fantasy can cope with any era at all. Napoleonic would certainly need some tweeks but off the top of my head - skirmisher shooting (infantry get shooting dice), square (infantry ignore swords and flags against mounted), more effective artillery (longer range and more shooting dice), Guards units (5 block infantry), Conscript units (3 block infantry) - and a lot more I am sure but the system is so simple, elegant and effective - more, more more stickers and blocks I say.
Regards,
gary