Thanks NXlimited for your reply,
First - You could go about setting the minimum boost to achieve say stock HP numbers down low (whether it be 3psi or 5psi). But I do see what you mean.
Second - The spring would still be there and would serve the exact same purpose as say a 9psi spring. The solenoid is a duty type designed to switch on and off very quickly to control boost, its going to cycle anyways and I am sure there is a maximum duty cycle set by the EBC which might be out of range to be able to do something like this.
Third - The spring as a response rate much the same as a boost control solenoid, in fact the solenoid will have much faster times. Running without (or with when the EBC requires) your spring opens and closes the valve continually to regulate pressure.
Here is a link to the 3d table that you have access to,
http://image.importtuner.com/f/tech/...+boost-map.jpg