I only miss one feature extreemly:
>>> Syntax highlighting for Code
Maybe you can put a BBCODE into it, that uses the Joomla Geshi plugin.
Now if anyone post any html or other code, the site eats it, and nothing is displayed.
The newest Version of Easy Book Reloaded also uses Geshi BBCODE, maybe you can look there how to impliment it.
Current version of JComments already supports syntax highlighting by GeSHi but this feature is disabled by default. Visit our forum and post question about this feature - I'll explain how to enable it.