When importing actors there are chances that a given name will have more than one hit in the actor selection list. At this point the user cannot know for sure which entry in the list correspond to the actor he/she is trying to import especially in cognominal (rare though) cases.
The only logical way I can think of is if we could have a system where eXtreme Movie Manager will pass the movie title, where a specific actor is sourced from, to the searching criteria. In this way the list of actors' names for selection will only hold valid actor names that correspond to the specific movie where a given actor is sourced from.