LRRL,
So I take it that you have spoken directly to BDM and that your communications is not going through a third part such as dealer? Find it very unusal that they would not cover it under warranty for though they eventually do wear out, 10k is way too soon and upon reading the warranty section of my O&M, it does not say disc/rotor are not covered, it does mention disc pads, but not the disc.
Of course like any legal mumble jumble, that section alsostates "Items or situation not covered include, but not limited to the following:"
I guess that could give them an out, just find it unusall with so few of miles. Also what is causing the excess wear anyway. Do your ride the brake excessively? If not were the brakes properly set up, has the mainteance been done properly, for overall, you are looking at changing a rotor sooner than many change the disc.
Welcome also and look forward to the detail intro, pics and do not forget to pin the map.