Yes, it will work for any region so long as there is some place I can grab the xmltv files from.

tv_grab_na_dtv is a grabber script that creates these xmltv files.
Usually there are websites that host the output of these grabber scripts which are xmltv format, I need one such link.

for example :
http://dikkeveter.nl/mythtv/xmltv/
hosts xmltv files for netherlands , there may be more.

SchedulesDirect provides this service as I mentioned in my first post in this thread but unfortunately they charge $20 per year, Im sure there are free sites. I'll look around too.
If you can find one , I'll be happy to add the US region to the app.

Alternatively, if you are happy to generate them yourself and host it, then Im sure there will be many maemoians in the US who will be happy
All you need is to run that grabber script either daily/weekly and host the output on your webserver . I can try and help with that.

thanks.