What about the United States?
I know I'm going to get shit like the US wasnt in the napoleonic wars, but in my opinion the War of 1812 is a part of the Napoleonic Wars/French Revolutionary Wars, and a second reason would be the Quasi War between the United States and France, a naval war fought over the French impressment of Americans into naval service, similar to the way the British were doing that sparked the War of 1812.
But I think they should add Spain, the Ottomans, and Netherlands, but add the smaller micro nations as units in the Special tab for their respective allies. Ex: Swiss/Polish/Bavarian are on France, so add Hannover to Prussia and Italians to France/Austria.