It is possible to play in one region, somehow. You can copy a mission as temp.tie into skirmish-folder and set its attribute to "save" (you cannot delete). Start the simulator and then the simulation (you player in first slot) without creating anything.
But some people are going further. I recently found a site:
where this problem is investigated and brought to a solution(?).
I will check this out and be happy if it works!
Bhakar (alias A.F.)