There is a commercial interface available in the UK which allows the use of your JR, Hitec/Sanwa, Futaba transmitter to be used as a joystick on the PC's game port. I am using one on my JR X388 xmitter and it works fine. You can find details on www.ripmax.com
Look under "simulators" then "R/C Joystick Interface". It is priced at £29.99 (I dont know if they can ship overseas!!)