Well im by far an expert, but iGo uses txt files for the speed cams. Can you not just copy the text from each country into one big file and use that.
It may takes a while during the first boot but it could work.
Alternatively have you tried just putting all the seperate files into the speed cam folder? In my version of igo I have 4 seperate files mobile,fixed,redlight and mobile and they all work fine.