You want a simple rule satisfying most of your desiderata? Very well:
Move the requirement of shirts numbered 50-79 out of the requirement for A's scrimmage formation and into the forward pass rules. You can have any unique numbering 1-99 you want on any down, but a forward pass is illegal if thrown during a down where you snapped without 5 players numbered 50-79 on A's line.
Such a regime would be similar to what existed in Canadian football until IIRC 1968, when you could snap with as few as 5 on A's line, but on a pass play you had to have at least 7.
Robert
Last edited by Robert Goodman; Wed Jan 07, 2009 at 03:50pm.
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