It already did do the 3% corner cutting back in 2011
Oddly enough I also thought about how to do that corner cutting myself back then, and asked about it specifically on the forum (Aug 2011), until I found out it was already being done.
But that 'corner cutting' is irrelevant when you consider that a new miner, mines literally at about 3000000 times faster than a CPU doing the same corner cutting and only uses about 10-20 times the power ...
Consider that a hash is about 1600 CPU instructions, so if you could make it only 1 instruction (which you can't), that's only a 1600 times speed up