Download the 0.9.1 version available in the sourceforge dedicated section. You can now use the comparison file editor to edit scenarios, you can locally launch a suite of scenarios to test... and you have a better looking report with a new style.
Mailing lists and forums are available on the Sourceforge project page
You can add your feature requests here on sourceforge.
You can report bugs here on sourceforge.
Latest jDiffChaser manual is available in the distribution archive as well as here