Art,
Great that your first reaction is a vague attempt to question the validity of what he’s doing. Haven’t we been here before, when you insisted that it’s easier to fake a SPOT track with a relay team than it is to fake emails from a few random strangers who claim to have seen you?
Nobody is going to devote time to devising rules for anything until the pioneer attempts are made, and then the rules/conventions will emerge organically and can be discussed.
Brian Lucido described what he was doing last year – following Steve Roper’s canonical route, which is thoroughly and accurately described in his book. The mountain passes are natural waypoints, and the precise route between them (where it’s off trail) is not critical. In general, Roper (and Andrew Skurka) describe optimal routes between the key passes and other major junctions, and I can’t offhand think of any shortcuts that are not blatantly deviating from large sections of the essential route that Roper describes. In effect, in his description of the route Roper has already done what you suggest.
But can’t we just celebrate what Leor’s doing for now, and argue about the arcane theoretical details of a general rule system for off-trail FKT’s if and when it really becomes necessary?