Hobbes wrote:Sci-fi/fantasy as the existing engine could do it well with a few tweaks and scenario designers could let their imagination run free (but only as a sideline - still need the historical games).
I was actually thinking the other day that a Lord of the Rings mod for AJE would be quite interesting to have a go at (I was palying Third Age Total War at the time - if you own Medieval 2 Total War and have any like for LotR, check it out!). Obviously that would need to be a mod as a full game would require the licenses, but sci-fi/fantasty/post-ap might make for an interesting concept. I agree with your overall conclusions that the historical games should take precedence though:
1. AACW2: I don't think anything needs to be said that hasn't already been said - my no.1.
2. Napoleonic: Sort of like ACW in that it is the bread and butter of these sort of wargames - I think it deserves a grand campaign on an AGEod engine.
3. 30 Years War: If a Napoleonic grand campaign is possible, this would presumably be only a further step - could even be an add-on sort of thing.
4. Various smaller scenarios of the more modern era: Spanish Civil War (though check out Leibstandarte's promising mod for RUS), Turkish Civil War, Mexican Revolution, South American wars of Independence would all make interesting additions. Having recently purchased PON2, a slightly more refined (or engine capable of executing the refined concepts) would be nice too. I'm less convinced about WW1 and WW2.
I could really go on for ever and ever - I'd buy almost anything you make
As a last point, from following Leibstandarte and Hobbes, the engine currently already has fairly promising modding capabilities, but a more refined editor to make new scenarios easier to create would also be a welcome addition.