Can I show addresses from other countries on the map?
Certainly. You may not need to add a country field to get Canadian addresses to show up. But adding a country field is easy.
First, create a country field in the Properties table. Then just add your country field as a parameter to the one line called within the script "GeoCodeAddress For ProMaps". Here is what the parameter should look like:
These changes will let you show addresses all over the place =)