Hey,
this my first post in this forum. Yihaa, time to celebrate 
.
I
In your SimpleGame your camera moves because SimpleGame uses FirstPersonHandler for input. you can choose to use some other input handler that has different behavior.
you can rotate your cube in several ways… simplest is probably by calling:
cube.lookAt(position, upVector);
Best place to start are the totorials in jmeTest package and the WiKi (though you must keep in mind the examples are mostly for jMe 1.0)
Thank you!
Well I
Well the GameState's update and render methods are called every frame… or so… which means you can put your code in the update method and it will get updated.
There are very good examples of all this in the jmetest package… really… check it out 