Still interested in yor method, UNN
It was such a long time ado, I can't find my original addons and test mission. But I started again, and it seems to be working as I remember. In fact better, it works at the distances available to human players. Always one of the things that annoyed me about the myopic AI. It sounds like it's not to dissimilar to the Mapfact scripts, I even did the same experiments with FOV.
I will post it up once I add the scripting commands to get the results, although it will probably need more work. But at least you can try it out.