Perl Best Practices is a book written by Damian Conway containing 256 guidelines on the art of coding Perl. Some guidelines (e.g. in Chapter 2, Code Layout, Indent with spaces, not tabs.) can be supported by an editor, while others (e.g. in Chapter 7, Documentation Comment anything that has puzzled you.) obviously can not. Which of these guidelines would you want support for?
There is both documentation and mailing lists over at www.nedit.org.