There's no connection, but it's similiar to the taiping rebellion in that it was a radical sect leading a large rebellion, I was thinking that these rebellions should play a part in any history we do, since christianity is already present in china it might be feasible for chinese christian sect arising and causing trouble, Either that or a sect similiar to the white lotus
Ah. Well I absolutely agree that radical sects and secret societies, both prominent in the history of China, should be included and worked with.
What of the Shogun style government, what character ought it to take?
It should be militaristic and focussed on conquering the rest of China. Narrowminded, Land, Aristocracy, and Mercantilist. It would still call itself Song, naturally, and make use of the Emperor as a mouthpiece for authority. I think it would be likely in such a situation in China that the "Shogun" character, would probably eventually declare himself Emperor and start a new dynasty, but frankly we're getting to have too many options here.
The only precedent I can think of is Dong Zhuo who basically took control of the Emperor Xian (Han Xiandi) from AD 189 to 192 at the end of the Han dynasty. In that case, the other powerful warlords and nobles were too strong for him to control. The important point of it, though, is that all of these other warlords (namely Cao Pi-- grandson of Cao Cao, Liu Bei, and Sun Quan) claimed to be founders of new dynasties and therefore emperors themselves.
Basically, this just means that the "Shogun" model is something that is a bit new. Lau Keung would need the support of either the palace eunuchs or the Confucian officials, each of whom at one point or another in history controlled the court. For Song, it makes more sense for it to be the eunuchs, as Song is in general not as closely tied to Confucianism given our Aberrated introduction of Theravadan Buddhism and Islam. He also would depend on the other warlords, naturally, to make sure a militarist government would be at all possible. So, in short, not very centralized.
Very aggressive, though, as victory and war would be the only things keeping the government's momentum. Unlike the Japanese model, simple respect for the "Tenno" wouldn't be enough; in China, peasant revolts DID see the overthrow of emperors.
Ideally, I would love for there to be a branching choice for the "shogunate" government... but we'll leave that be for me.
Also, the position held by Lau Keung and his descendants would be called either Dajiang (大將) or Dajun (大君). The first one means literally "Supreme General" or "Top General" or somesuch-basically commander in chief- and the second means "Supreme ruler". You pick.