Yesterday, I released a simple plugin, Random 3D Layout to the  Gephi Marketplace here. It's very simple, and I developed it as part of my work at NGRAIN.

For anyone working in 3D in Gephi, this will be a useful and simple initialization layout plugin. Works well with the Force Atlas 3D Plugin. Without it and using a 2D layout to initialize instead, the 3D results can sometimes be milky-way-shaped, not generally spherical as you would expect, and ultimately not taking full advantage of the third dimension.