Just thought I'd mention that I found a solution. The "Manhattan" USB adapter seems to work with the old gameport version of the Simped rudder pedals.
The settings that worked for me was Mode 2 (there is a selector for 4 "modes" on the Manhattan).
On the Simped gameport connector there is also a series of four DIP switches. I have them set as 1=ON, 2=OFF, 3=ON, 4=OFF.
I am using Windows 7 64 bit Ultimate.
At least in Rise of Flight I was able to select the Simped rudder pedals and they worked great. I have a CH Flightstick (USB version) that is also connected and that worked fine as well at the same time.
The Manhattan USB adapter that I found was on Amazon. Here's a link for those that are interested - Manhattan USB Adapter on Amazon
Best of luck!