Thanks, Pablo. I see in the Sigma user manual that there is indeed a slider built into the software allowing adjustment of the focus throw. If anybody has tested this, I'd be very interested in learning the results. Because my biggest and maybe single complaint about the 50mm f/1.4 is the short focus throw.
I went ahead and ordered the USB dock out of curiosity. Supposedly, it'll arrive in around 10 days here in Vietnam.