Description of problem:
Default /etc/screenrc file seems to be a merge of an example global and an example user's .screenrc file.  While this is quite strange by itself, the worse is that certain configuration options are duplicated in the file ('vbell on' on 2 places is what annoys me the most).

Polished default screenrc file can make this inherently unreadable file (I guess very few users can parse terminfo / termcap options, I certainly don't ;) slightly more manageable.  Additional comments are always welcome.