So you want 6DOF movement with the keyboard and orientation with the mouse. This should work.
Code:
import vizcam
viz.cam.setHandler(vizcam.KeyboardCamera(forward='w',backward='s', left='a',right='d',turnRight='e',turnLeft='q'))
def mousemove(e):
euler = view.get(viz.HEAD_EULER)
euler[0] += e.dx*0.1
euler[1] += -e.dy*0.1
euler[1] = viz.clamp(euler[1],-90.0,90.0)
view.rotate(euler,viz.HEAD_ORI)
viz.callback(viz.MOUSE_MOVE_EVENT,mousemove)