Probably would have been more authoritarian, and taking away rights that other clans held to increase the power of the overall village. I can see him acting much like we presume/heard Tobirama was. Expect, with the Uchiha clan already not liking him too much. . I don't think he'll play favorites, or give his own clan too many freedoms. Sort of like a middle finger for them defecting to the Senju on him.
He'd also have forced the other hidden villages to obey Konoha. . . Would have started a massive war (Or revolt, depending if Madara/Konoha could have conquered the other villages) that would have led to his death somehow.
Though, I'm sure he would be a great leader when it comes to interior problems. Like roads, fixing bridges, etc. He seems like the nice, tender and caring man to do that. . . . . . . . . . .