It was explained back here, but yeah a link to it in calculator description would be helpful.
I don't know why but I couldn't get it to work via the .ini, it would always round to the closest even number and the corresponding LastConvertedMouseSensitivity. Pasting it in the game however yields a similar LastConvertedMouseSensitivity to what "Config File 1" would give me so it seems to be working that way.