The implementation to display complete list of countries is easy. The list of countries without find can be collapsed by default to prevent of "cluttering". I dont think, that static list somewhere in the FAQ is the same as this feature. I dont want to compare two lists manually, if it can be done automatically.
My suggestion is much easier for implementation than the feature described by PHIL, but it could work for me too.
BTW PHIL's comment is relevant and describes different way how to implement my suggestion.