I’m not aware of any limitation. @123toid do you have any idea why?
I believe you are only inputting the numbers in Green, all else is auto-calculated. If you are doing that and the units are correct, then it SHOULD work. If that doesn’t work, download my driver file above (the .txt file) and change its extension to .wpr and move it to where your other driver files are located. You can then go into the driver editor and check the units to make sure the units are correct. Reference my last screen cap above.
I’ll be back later.