Is there anyone who knows an exist plugin which can achieve this function,or have any idea on how to write a plugin for it?
If the Comment facility is not good for you, then you probably need to go and make your own. I would recommend taking a look at the BugReportHandler as an example plugin!
You can also see a great example of how it works at http:// sandbox.jspwiki.org/Wiki.jsp?page=BugReportSystem
/Janne
