I ran the Accell Gen 7 on one of my projects. I did plan 1a. Pump to rear fuel rail. Crossover at front fuel rails and regulator at rear fuel rail that returned to tank. I had no problems with this set up.
I like the idea of a system that uses a mass flow meter. This is the only one I am aware of. I have not used it.
Not to hijack the thread, but I would be interested if anyone here has.
http://www.massfloefi.com/