I think this is along the idea of what you are looking for:
http://greenfairyquilts.blogspot.com...lat-seams.html
The tutorial is showing it with triangles, but it works with squares/rectangles too. I am doing it on my current project and it makes the intersection nice and flat. Basically, once you sew your final seam on the block, you clip the few stitches in the cross seam and press those 4 seams all in the same direction. The pics will help explain better I am sure.
