Has anyone used this with any success ?
I don't think you can create your own filter files. We got a rewrite filter file from JTAC when we had a problem with CTS client access.
Not all rewrite problems will have a rewrite filter. Only problems that require minor change may have a filter developed (by juniper engineering).
Not all rewrite issues will have a rewrite fiter developed. Juniper engineering writes these filters and its decided on a case by case basis.