I'm not sure about the KP4000 2-way modules; but I'm interested in your findings.
I've played with most of the 2-way modules that Integra has to offer with a MX-5000 and without a display they're limited at best. Although they give "now playing" feed back on your remote. Navigating through VTuner, Sirius or Pandora is impossible without the receiver display or a TV.

They should really be called "now playing" modules because without a display "on" for proper navigation the module is quite frankly useless.
I really don't want to turn on my display to listen to Pandora.

I'm interested to know if the Kp-4000 has more functionality with 2-way modules?