Displaying orbits & zooming

So everything can be in 64 bit precision? This would go a long way towards fixing problems that I am seeing. What do I have to do in order to ensure that everything is in 64 bit? Do I have to always do things like:

    node.setPos(LVecBase3D(0,93000000,0))

Is there anything else I should do? Is there a way to tell the engine to use double precision throughout?