I've seen 81, 8000, 8080 as 'standard' alternatives for port 80.
It's probably best to stick with 8000 or 8080. I know RPMs are
usually very quite, but you could include a small script that tries
to conenct to 8000 and 8080, takes which ever port is free and
outputs a line to stderr with a notice of which it chose (if it's
different from the default/documented).
I have no idea of how 'un-RPM'-style this is. Since the number of
parameters to configure is very small, a small after-install script
that allows you to alter the defaults would be very nice to have.
