Integration with Farseer? (box 2d port)

I've been making great progress with Farseer as my 2d physics engine, but the problem is that the engine is built for small interactions (characters being 1-2px in size)
I was just wondering if anyone else has experience with this? my options are to scale my artwork way down, but zoom the camera in, so that everything still looks the same.
The other option is run the simulation as-is off screen, and then translate all coordinates to a larger space where my actual sprites are.
I feel with either option I'll run into logistics issues in regard to adding other unity assets such as lighting, particle systems, shaders, etc.

thanks!