Emacs: separate limitations of revision range and shown changesets. For revision range limitation, use "-r" opt with range notation at "hg log" invocation, and use hg-rev-completion-limit as default value. For shown changesets limitation, use "-l" opt at "hg log" invocation, and use hg-log-limit as default value.

#!/usr/bin/env python
#
# An example CGI script to use hgweb, edit as necessary

import cgitb, os, sys
cgitb.enable()

# sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
from mercurial import hgweb

h = hgweb.hgweb("/path/to/repo", "repository name")
h.run()