Complicating things, from my standpoint, is that when I clinched all of US 12, from Washington State to Detroit, my travel through Ft. Atkinson was eastbound along Robert and 3rd Streets. My preference would be to avoid separate US 12 routes through Ft. Atkinson, unless the main route followed Robert and 3rd Streets. Some other user, who traveled US 12 in Ft. Atkinson from east to west, might feel differently, as would travelers on WI 89 and WI 26 Bus that connect to US 12 at Main St.
EDIT: I didn't realize, until I left my hotel this morning, that this day's travels (basically most of US 18 in Wisconsin) would take me within a few miles of Ft. Atkinson. I took that detour, and traveled both the southbound and northbound US 12 routings in Ft. Atkinson. So however this gets resolved, I'm covered.