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it is possible to have more flow with one rail as well. mass flow rate: cross sectional area*density*velocity. given velocity and density constant, if the single rail had an area of A=10cm^2 and the double rail had a total area of A=5cm^2, then the mass flow rate of the single would possibly be more advantageous for high flows. we have to consider laminar and turbulent flow in design as well. but, back to flow rates, if the rail is too big, then the fuel pump might have to work too hard to keep it at pressure. and, as you said earlier, if the rail is too small, it will not flow well at higher flow rates due to restriction and excessive turbulence associated with the higher velocities.
all in all, i was just saying that you are not necessarily shooting yourself in the foot if you have a single rail, just depends on the characteristics of that single rail. i was always taught to keep an open mind in the design realm.
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