The sound track on the disc is 5.1, so there obviously is surround activity. The isolated score is 2.0; if you're getting surround from that it's because you're using Pro-Logic, and so most stereo effects are being duplicated in your surrounds. The 5.1 track will probably only have surround activity for a few effects here and there; the music will stay up front, as it was on theatrical release.
I figured this was much like the same kind of mix similar to The Guns of Navarone, which has only 3 instances of sound effects--no music coming from the surround speakers. But on The Blue Max, there is nothing in the surround speakers what soever--not even any sound effects. i am wondering if the disc is defective?