Hi Bjorn,
I do have some memory of that conversation, but I can't remember exactly what I said either :)
It is a good point - at the moment there is no easy way to import large borders in CSV format because we split the tracks, so I will have a think about that.
In the mean time the only way is going to be to import a gpx or kml file directly into the project. If you send over your gpx file I will take a look to see why RM doesn't like it. Alternatively, if you can get your gpx file into Google Earth and resave it as a kml polyon or linestring, then you should be able to import that.
Matt