@BenediZ
To Move the whole scene, create a dummy object and place a dummy at the origin 0,0,0 in world space. (Entering dummy() in the Max Listener will do this. ) Then select everything in the scene and parent it all to the dummy. Then you can select and move the dummy parent and everything in the scene will be moved along with it. To revert back to previous position of objects just zero the position of the dummy.
For scaling everything, I use a different approach because if you have rigged characters with bones for example scaling the dummy parent would scale things at the object level for objects and can cause unpredictable results with non 100% scaling and animation. So for scaling an entire scene I just use the Utilities>Rescale World Units and select the Affect Scene radio button in the dialogue and use what ever scale factor you want. To revert to the original scale, you do the same thing but using 1/X for the scale factor you originally applied.