I'm not sure, it's been a while.
I just remember one of my old scenerios.
A Huge enemy city on a large winter island, surround by unclaimed settlement outposts.
The player started out with just one charater, a women villiger, no bouilings or anything. Then she eventually changes into Circe, and you must perform a bunch of objectives as her like save prisoners and stuff.
My point is I had a bunch of objectives, they were the first thing I added, and did not get the message of what you speak.
Maybe there is a scn. type feild somewhere I can't think of right now, like Death Match or Normal Scenario. Maybe it has something to do with the string ID. I don't know.
The easiest way is just give your self a town center. But also, try giving that player some alies too. That might do something. All in all I would just wait for someone else to reply who knows exactly how this works.