I don't think that there's room to do that - and I don't think that it would look too good either.
>Why markers and not regions? I know you can set a marker and specify the start and end time, but why not call it what everyone else does a region.
Because a cue mark isn't a region. The time between two cue marks has always been called a range, and just because other software, in my view inaccurately, calls it a 'region (which I regard as being a part of the country you live in) is no reason for Audition to do so.
>On the plus side,I am extremely impressed by Audition's audio engine and it's spectacular sound!
Whilst I'm glad that you are impressed, I have to say that Audition has no sound of its own at all - it's strictly neutral. Unless you do something specific to alter it, what goes in is exactly what comes out.