I always assumed they had an option for both imperial and metric...
It would make sense if that was the case. Perhaps the saving of a $0.05 cent switch...
I'm guessing that if you take a look at the PCB there will be two tracks (or diodes, resistors, legs on an IC etc) on the board designed to be cut, cut X for metric or cut Y for imperial. This technique is quite commonly found in digital radio tuners, specifically AM to change the tuning step for various markets.
Anyone have one that would be willing to remove and photograph the PCB for me?
If this is the case, it would be quite simple to install a switch and have both modes available.
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I like your thinking! Reminds me of the time I helped a friend unlock two extra cores on his AMD Athlon chip, to save redesigning a new dual core they just re-marketed a quad core with two of its cores disabled...