wu-ftpd still installed when there already an installed proftpd on the system.
Not a bug. If you ask the installer to install wu-ftpd (which you do by selecting to install the networking packages), it should do just that.
when I ask the installer to UPGRADE to 7.0 from 6.2 and do NOT choose or change any package than I assume it is just fresh (ie. rpm -F) and the required packages are installed. and that's not true, since wu-ftpd was not installed and after the upgrade it's installed.
That's what it does... You probably didn't deinstall your old wu-ftpd package using rpm. The installer uses the rpm database to figure out which packages you have installed. Reassigning to anaconda (the installer) so they can check for sure whether or not there's a problem.
does proftpd have a "Conflicts: wu-ftpd" in the package? If not, we try to offer wu-ftpd as a surrogate parent for /usr/sbin/in.ftpd. You would need to deselect wu-ftpd in "customize pacakges to upgrade" if this explicit Conflicts: is missing from the package.