Responding a year after the original post is a bit crazy, but I decided to mark this thread solved even though it is not completely solved. Having been forced to install the printer as a network printer on another computer (where CUPS for some reason refused to recognize the USB connection), I returned to my computer and configured the scanner as a network scanner.
Now, when I go to scan with the printer plugged into the computer, the scanner appears with both its network and USB connections (net1;dev0 and bus1;dev2 on my system). However, only the network connection will work for scanning.
I guess Brother was serious about that "W" in the model number!
Statistics: Posted by aguador — Oct 4th, ’14, 21:32