Thanks R`as.
I guess the first suggestion that comes to mind is about the Portuguese Teppo. I think in the original STW, the Portuguese arquebusiers were an early access firearms unit which came with a price (acceptance of christianity). I think it would be a good to put the PTeppo back into this kind of context and perhaps increase the effectiveness of the firearms to reflect their historical value. In MTW, they were probably more novelty units than anything else, but in Japan, the firearm had an instant impact on the nature of warfare. Maybe this trend towards guns could be shown more in the campaign, perhaps forcing the player to seriously think about adopting the same tactics (I know I for one hardly ever used the gun units in the original STW, simply never felt that they were a threat to the traditional units).
Ok, I hope I didn`t squeeze too much into that suggestion!
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