With the stock KPG-59D you can put in freqs 10mhz less then hex-edit the file to move the freqs from 40mhz to 50mhz. The freq area in the file is $1840-$1A3F. An easier way is to use my modified version of KPG59D which I call KPG59X. This allows you to directly enter in 6-meter & 10-meter frequencies.

KPG59X is designed to be installed with the KPG59D files. Install KPG59D then put KPG59X.exe into the folder where KPG59D.exe is. Then run KPG59X.exe instead of KPG59D.exe.

KPG59X looks like DOS app, but works fine in Windows (Windows 7 is 100% OK).