Well....

You can't move anything around in the 2D picture.

You can place 3D objects "within" the 2D panoramic fields to give you both dynamic and movable objects.

You can move the light sourcing too, but if you do this, it will no longer correspond to the static image background...

One reason I'm a 3D field kind of person.

John:

There are two ways of modifying the C.G. of a plane.

G3 has a built in "physics" editor that lets you adjust every physical behaviour and parameter possible, of each plane.

In the Physics Editor, you can adjust the C.G. in a brute force manner with the first entry called C.G. You can move the C.G. around in three dimensions.

However this is not the best way to do it. It is there to permit you to "fine tune" the model when it is say, within 10% of where it should be. If you make extreme changes by merely moving the C.G. you'll get an unrealistically flying plane.

Instead you should modify the weight of each of the component parts to bring the C.G. in line with what you want and then use the C.G. settings to fine tune things.

This lets the program code better handle the model characteristics and results in very real behaviour.

It is also more in line with what you would do in the real world... e.g. move the battery, etc.