[carmatana]

It turns out that the criteria used to determine if the film is "foreign" includes studios.
So if one of the film's production companies is from an English speaking country (which is undoubtedly the case for these movies), XBMC will determine the original title as international / US.
I have been told that is the best that can be done, altering these rules will create even more false positives in other areas.

I found that if in the file:

\XBMC\userdata\addon_data\metadata.imdb.com\settings.xml

The line

<setting id="akatitles" value="USA / International" />

is forced to only "USA":

<setting id="akatitles" value="USA" />

The number of true American Titles improves a lot.

In a collection with 60 or so non-USA/UK, with the standard "USA / International" I got like 40~50% with the original title (or worse, the spanish title) and not the American one.

when forced to "USA" less than 10%. I tried also with just "International" but there were no significant changes..

It may be a good idea to separate USA and International.

My movie collection is organized each movie in its own folder. And by default there is a Movie.nfo in each folder with the imdb url. So no problem with false positives but there may be.

I also discovered that for this stubborn movies I can force the title in the same nfo file (Library Import Export section in the wiki)