Hi Phil!
I'm not a grid-square chaser so I'm not familiar with the customs, but doesn't this seem just a *little* out of touch with the spirit of the rules?
I don't think it's out of touch with the spirit of the VUCC rules. If anything, it's exactly within the letter and spirit of the current rules. Once you know where the intersection or boundary line is located, you make sure your station occupies some part of each grid, as explained in sections 4(e) and 4(f) of the VUCC rules:
http://www.arrl.org/files/file/Awards/VUCC%20Rules%202011_Rev%2020110512.pdf
In the past, these sections were not as verbose as they are now. The VUCC rules previously stated that you had to be able to provide ARRL documentation if requested and that GPS was acceptable in determining your location on a boundary or intersection. There were no definitions of how a portable or mobile station had to be situated, no mention of the GPS accuracy or WAAS, and no mention of what would be acceptable documentation of a station on a boundary or intersection.
Using KB5WIA's trip as the example, what better way to know that your station is in all 4 grids than to determine where that intersection is, and then making sure equipment is in each of the grids? Dave went to some lengths with ARRL to make sure his plans would pass muster with them, even to the point of making it difficult for him to work many passes to his east while complying with the VUCC rules.
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/