Old man Lerner here with a S-A 2-speed w/ coaster on a Raleigh Grand Sports frame:





That bike was my primary winter commuter with studded tires. I ran a front brake as well and, truthfully, used that front for 90% of my braking needs rather than relying on the coaster. In its latest iteration, I'm running a 7-speed Nexus rear wheel with coaster brake (thanks, Zaphod!). When I took it out for an errand run the other day, I forgot about the coaster a couple of times and found myself stopping unexpectedly, but it's not like running into the back of a car or anything.

Neal