That is fine.  First friendly answer I have ever get from here. ^_^  Glad
to hear that your tool will enforce a hard limit for resources used.  I wish
you can keep your words.

    I have downloaded HTTrack and tried it.  I was frightened that it can
disable respecting robots.txt rules, setting the User-Agent string.  It
doesn't work for "Disallow: /" (disallow everything), either.  Those are not
polite for a spider, too.  Please remove those options, and fix the "Disallow:
/" problem.  Not all contents are GPL or GDL.  Please respect the content
providers' intension on how to provide or distribute our content, be honest
about your user-agent identity and allow content providers to have special
treatment on you.

    You may refer to the robots.txt standard at:
<http://www.robotstxt.org/wc/norobots.html> .  The "Disallow: " is only a
prefix.  Anything matching that prefix should be excluded, not only
directories.

    I have double checked the wget manual.  No, there is have no option for
simutanuous connections.  The user cannot disable robots.txt rules, too.

    I'm writing GNU GPL softwares, too.  I believe GNU GPL softwares are made
to help people, but not to hurt people.

    A small suggestion:  Allowing abuse only within the same IP network, or
localhost.  That is not hard.