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I dont think there are constant pressure regulators. The normal FPR rises the fuel pressure in response to intake manifold pressure ( with the vacuum line ). The aftermarket ones sometimes rise at a higher rate , and usually also let you adjust the base pressure.
Ebay is unfortunately being mis-used by people selling dodgy fakes - the whole site is getting a bad reputation from these guys.
Its best to just buy from a shop. If something is super-cheap on ebay , there's probably a good reason. With fuel related modifications, you dont want anything to go wrong else you'll risk a fire !
The ECU probably does some minor adjustment with the reading it gets from the oxygen sensor, but for acceleration it relies mostly on the air intake sensor.
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