It is doable, but there too many parameters to adjust in order to make it really good.
The most important are:
1. Correct setting of Waypoints (be careful with density because it affects speed of AI movement)
2. Correct setting of VP flags on-map and outside the exit borders (on Grey hexes)
3. Complicated delaying mechanism (for both infantry and vehicles) by the use of impassable terrain and rough terrain.
4. Precise timing for most mobile infantry unit (because this one will be the first to reach any off map VP hex)
5. Avoid using units such cavalry or motorcycles
6. Set the AI to delay
7. Be careful where you place roads along the axis of pursuit
Btw, take a look at the convoy mission thread:
http://www.shrapnelcommunity.com/thr...b=5&o=&fpart=1
cheers,
Pyros