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So I'm a little confused here... you are trying to increase engine braking, correct? A tried and true method of this is to use an exhaust brake. I suppose you could install a throttle somewhere in the intake tract and close that to produce engine braking, but I'm not sure if there would be any consequences to doing that (aside from introducing an obstruction to the intake tract).
If you are trying to cut fuel completely while coasting I would use caution. As stated before, injector pumps are lubed by fuel. While the injector pump may stay primed on the low pressure side, the high pressure side might be starved of lube. The fuel cut solenoid drops the collar separating the high from the low side. I'm not sure if this just lets the fuel bypass and go back to the tank via the return line or if the lift pump is still running and slowly pressurizing the low side causing leaks from the seals. Hopefully someone with experience with VW IDI engines will chime in and confirm or deny this.
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