Hi,
I tried using vars_post but the request always had the post params missing, e.g.:

POST /demantra/common/loginCheck.jsp/../../GraphServlet HTTP/1.1
Host: x.x.x.x:8080
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Content-Type: application/x-www-form-urlencoded
Content-Length: 0

Will check again over the weekend.