I don't think there's really a true way to do that, but you could edit the files to decrease the amount of impressiveness certain buildings are worth. Then you can just build those and not have to worry about winning the game accidentally by being "
![G o o d [Good]](/emoticons/g_o_o_d.gif)
".
That was my big beef with the game as well, being a
![G o o d [Good]](/emoticons/g_o_o_d.gif)
god mind you. That I would win the game and take over the land before I got even close to completing the city I wanted to build.
I'll see if I can look and remember what values in what files need to be changed. I haven't messed with modding in ages, but you can check out the modding forums and search there if you don't feel like waiting for someone to get back to you.
We can't cure the world of sorrows, but we can choose to live our lives in happiness.