If you want to turn left/right instead of moving left/right using the following code:
Code:
#Turn right
viz.MainView.setEuler(90*viz.elapsed(),0,0,viz.HEAD_ORI,viz.REL_LOCAL)
#Turn left
viz.MainView.setEuler(-90*viz.elapsed(),0,0,viz.HEAD_ORI,viz.REL_LOCAL)
I'm sorry, I don't understand your second question.