Thanks to ChickenMan for leading me in the right direction. There is now a modified pxdrv.dll for RecordNow 4.5 and 4.6. This lets RN show the real speeds instead of Max, Mid, and Min when used with the NEC 3500. This is the most up to date pxdrv.dll available and is based on the same one in my other topic.
The dll can be found here.