I'm only familiar with one jimmy johns located in downtown raleigh, nc. But I've noticed that several of their delivery riders use brakeless fixed gear bikes. I have no problems with this, but I can imagine several scenarios wherein legal problems may occur for JJ.
I've also noticed the riders run red lights, weave around cars, etc. Again, I don't mind that type of riding as long as it doesn't create traffic problems that otherwise wouldn't occur. I've considered contacting the JJ manager, I doubt he knows what a brakeless bike looks like. But I'm not inclined to act on things that don't directly affect me. Right?