I want to share a thought but, I will have to use an example to do it.
I have a Olimex STM 32 (LeafLabs Maple clone) and the counts are different when using analog buttons in comparison to the Arduino Uno. To use the DFRobot sketches, I had to adjust the values by testing each button with the serial monitor showing the analogRead results. This is because of the higher bit resolution of the analogRead.
That being said, to be able to port the library to other boards such as the Due, you may need a way to work with a spread of analogRead results.