Emmalee,

No, you can't. Yes, you can.

Although there's no way to change the 3D centerpoint, there are two workarounds.
1 - Put an object (far) off-center, so that the center shifts in the direction you desire.
2 - Using the Virtual visitor you can set a (very) high viewpoint to get exactly the viewpoint you want. You can store several points of view, so you can easily switch from one point of view to another.

Hans