Drew,I believe Carrol Smith makes a comment in one of his books that if you're really clever, you could have a 'dry' set of rockers and a 'rain' set of rockers, so if the track gets damp or wet you can just swap the rockers to simultaneously raise the ride height and soften the wheel rate without having to corner-weight the car again like you would have to with a spring change.
I was under the impression that this was the historic reason that rockers were developed and used in the first place. Also, I'm pretty sure you could have both "dry" and "setup" positions with the same rocker with two different mounting holes for either the push/pull rod or the damper.
I also have not seen too many examples of FSAE cars with outboard mounted direct actuated dampers that did not have significantly low motion ratios(spring travel/wheel travel), or a drastically(in my opinion) digressive nature. Both of those reasons would push my choice to rockers.