|Derek Vande Brake|
Best advice I can give... plan out the tech tree in advance and make sure everyone knows it.
I once tried playing in a game like this (before PF so the rules were very handwaved) and it was horrible. I was trying to build up my economy first, and the GM as it turned out favored military development. So the players who focused on that made several breakthroughs early on giving them advantages each time, while those of us who went a more peaceful route kept spending our turns building "prerequisites" to what we wanted, none of which actually gave any benefits.
Player 1 develops sharpened stone, giving bonuses to attack! Player 1 develops unit tactics giving bonuses to attack! Player 1 develops armor giving bonuses to defense!
Player 2 develops the idea of digging. Player 2 develops the idea of harvesting raw materials. Player 2 develops the idea of using raw materials. Player 2 develops the idea of making simple huts, finally giving a bonus to survival in cold climates.