Arduino Mega 2560 + Sparkfun quadstepper for MATLAB GUI?

Hi all, I'll try to keep this question as concise as possible.

Does anyone have any experience with the MATLAB ArduinoIO package in relation to stepper motors?

I'm undergoing a project to control a robot arm with 4 stepper motors and have them all running fine by uploading sketches with the quadstepper library provided by spark fun. However i would like some easy user input via a GUI created in MATLAB, the problem with the matlab arduino package is that it supports the adafruit motor shield as standard and i can't see a clear way of altering the code to support the quadstep library, or any other library for that matter.

Links:
ArduinoIO package: http://www.mathworks.co.uk/matlabcentral/fileexchange/32374-matlab-support-package-for-arduino--aka-arduinoio-package

Quadstep library: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Robotics/quadstep.zip

Inside the arduinoIO package the motor_v1 sketch is what's uploaded to allow the arduino and matlab to talk to each other and for the life of me i can't figure out how to alter that code to fit the quadstep library to allow me to control all 4 motors using matlab via the sparkfun quadstepper board. I'm very much a novice when it comes to programming and i'm trying to learn fast.

If anyone has any experience related to this i'd be beyond grateful if you could point me in the right direction.