[jQuery] JQuery Form Plugin and json

Hello,
I'm using the jQuery Form PlugIn( http://www.malsup.com/jquery/form/ )
to handle my Forms. I like it, but I have a question about an
improvment:
At this time all form fields are send using post, but it wold be nice,
to send all form fields json encoded as one post parameter.
Is there a way to do this?
Thanks and greetings,
Stefan Sturm