The real issue with dead head systems is what's called 'hammering', or hydraulic shock. This occurs when the 'column' of fuel in the rail is subjected to the pressure changes induced by the injectors opening and closing. To combat this, fuel dampners can be used, but it's better in high-volume applications to use the typical return style system.
Look at the dampners at this sight, and the explination of hammering.
http://www.injector.com/fueldampers....72ee3053fe9e5a
Yes, it is much easier to package dead-head systems, and with smaller injectors and demand, it's usually not a problem.
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