Well, the Mapmaking Oracle (that would be me...) to the rescue!
You can find all about special victory conditions and setting VPs on page 3 of the Mapedit PDF. End of first column and the beginning of the second.
Assigning victory points is easy.
Code:
#victorypoints <province nbr><1-7>
Now, what you do is pick the special provinces you want, assign the appropriate number of VPs to each. Once you know how many VPs in total there are on the map and how they're distributed, you will know what kind of VP number will be useful a reasonable one for a VP based win.
I'm not sure if you have to use this command
Code:
#victorycondition 1 <VPs required>
to enable the VP based approach, but I'm thinking that if you put it in the map file, the map will be hardcoded to ALWAYS use the VP condition. If you just assign the VPs to the appropriate provinces, you can then set the VP condition from the game settings menu when you create a new game using the map.
This
should answer your question, but if you have any more, feel free to fire at will. If it's not something completely insane and strange using proprietary undocumented info from IW, I should be able to help you out.
Edi