First, you can submit a request for this driver at: http://zone.ni.com/idnet/other.htm National Instruments develops drivers based on demand and popularity so the more requests NI has for it, the greater the possibility that Ni will develop one.
If you would like to try developing your own instrument driver (or modify the existing one), NI provides documentation, model instrument drivers, and driver templates to help at : http://zone.ni.com/idnet/development.htm).
National also has a syndicate of third party vendors that specialize in National Instruments' products and services. Some of the vendors specialize in driver development. I would suggest contacting one of the Alliance members at: http://www.ni.com/alliance