Redmine uses Textile syntax for text formatting. Currently Orangutan tries to support Redmine Wiki syntax by own... And does it buggy.
Perl has a module
Text::Textile, which I believe, could be used in Orangutan to parse Textile syntax. This should be investigated and, if ok, implemented.
Perl module package: libtext-textile-perl
See also: http://search.cpan.org/dist/Text-Textile/