Not sure if Brett has sorted you out or not, thats the problem with doing the PM thing
If he hasnt then all you do is go to your Mach3 folder and double click on Screen4.exe. When that opens open the screenset you are using from the File menu then Open. If its the standard mill one it will be 1024.set, once thats open just double click on the DRO for Feed per Rev and change it from the dropdown box to Feedrate, then in the Format string change to a 4 after the decimal point, then thats you done, just save and exit You might want to however save the set as a custom one, if so then instead of save use Save As option and name it what you want. When you next open Mach go to View menu the Screens and browse and load the screenset.
As said previously it will only really display the feedrate set in the code, it wont distinguish between a G94 or G95 move.
Hood