I am unable to position my speakers in a perfect geometrical arrangement, thus will need to adjust the relative levels of the L/R and the rears. Is this is a standard feature of most AV amps? (possibly looking at the Denon 1802 or 2802)

I assume that most setups (whether user-defined or built-in) are recallable via the remote? And if so, is it a scrolling process, or are they individually addressable, for recall by the Pronto?