The rebound setting controls the speed of the return from compression, regardless of spring. I was doing that myself in rFactor in a 2008.
I'm not talking about the rate or response, I'm talking about the initiation of the response.
take a coil spring, if you apply a force it compresses, if you remove or reduce the force it extend immediately (for all intensive purposes). If you add a damper to the system, you can change the rate it compresses and extends, but it still reacts to the change in forces immediately. both these examples are legal.
Given the right mechanical/hydraulic setup, you can delay the response, or limit it so substantially, that it is essentially delayed.
Under breaking the suspension compresses 20mm, but after the driver lets off the breaks, it takes half a second for the suspension to start to un-compress. (Not legal)
The suspension, as long as no energy is added to the system, is passive, and good under the rules, no matter what the intent of the settings.
No, you are wrong as far as the FIA is concerned, as they will say it violates rule 3.15. The FIA will use the word Intent to incriminate you.
With the exception of the parts necessary for the adjustment described in Article 3.18, any car
system, device or procedure which uses driver movement as a means of altering the
aerodynamic characteristics of the car is prohibited.