bbishop:
Apologies for that, I don't know where to begin with changing the code from the standard stepper library to accelstepper, that's why I don't have code to show
Go google "arduino accelstepper tutorial"
Try out one of the many, many examples out there. If you run in to problems, let us know.
After you get accelstepper working, try building form there to run your multiple motors.
Try adding buttons to control the different modes you want.