I fail to see how the dimensions of the table could be required to be 2:1 for any aiming system. At any given time to make ANY shot you are using just a small fraction of the table. As long as the angles on the table are four 90 degree angles in the corners I just don't see how playing on a square table would be any different, since when making any shot you rarely use very much of the table at all.
If I had the ability to draw it up, which I may, I just don't see how a straight shot or a 15/45/90 into a corner pocket on ANY square or rectangular table would be any different visually or physically than any other. The physics of the balls, rails and pockets, as well as the felt and chalk would remain constant. A cut to any certain angle would remain constant.
I often do Tor Lowry's half table pattern drills, I make most every shot I attempt while doing this. How is this possible when on a 2:1 table, using half the table means I am on a 1:1 table, but all of the cuts, banks and straight in shots go in just like they do when I am playing full table patterns, same hit, same stroke and same equipment??? By the logic of a table HAVING to be 2:1 for aiming to be precise...it theoretically should not be possible, right?!
I can see whereas banks and kicks would be affected, but most of the typical shots used in pool, I would bet I could make on any rectangular surface.