>It seems like it should be fairly good bang for buck, in this sense, to just hire people to drive around kind of slowly and badly. Nothing overtly aggressive, but a few dozen people driving slowly around a few select traffic circles around rush hour should really gum things up.

I see this as a complete win. It would quickly result in cops aggressively enforcing the existing traffic laws that already make this kind of behavior ticket-able.

It will be a glorious day when driving like a slug carries more risk of being stopped and ticketed than speeding, rolling an empty 4-way stop or otherwise driving like a normal person.