[Cohen]

Well, new buildings could be nice, like some "castle required" building like a training camp (troops produced there gets 1 experience start), or defensive postation/trebuchets (sieging force suffer some casualty when sieging, depending of defenders strenght) and something similar.

I believe he told to take Pythium because historically Romans were the first to use roads for moving fast their armies and to keep armies supplied. I mean, to use roads massively, since roads were built a very short time later the army conquered the province.