Yeah Graham
Plenty of ideas
What would most interest me is some expansion or scenario to play it during the middle ages. For example, from 1000 to 1792. Most of the concepts are similar. You can treat vassals as parts of the country for simplicity. The BIG problem for that is : how to deal with the Asian very big powers, like the mongols of course. Maybe the problem of the impassable countries in Asia would also appear. Well, this is only a suggestion, as I realize the problems I will meet.
Most simple, expansion from 1453 to 1492 and after. I've heard about an expansion already made for the BG. With the datas of the BG, it can be handled easily I think. And every concept is the same. Because the beginning of the Modern Ages happened during this 1453-1492 period : portuguese were already expanding overseas, there is no more Byzance, nor Schism in the Catholic church.
And if you need short scenarios that happened during the game period, the BG provides so much that there is no problem with that. Examples : wars of Louis XIV of France, 30 years war, some less know wars like Venice against Turkey in mid XVIIth, Russia against Turkey in the late XVIIIth, most of the succession wars, England against Holland (1666-1667), Italy's campaign, etc.
Raf