Here’s one option:
I’m not sure if the 3D Assistants Lite (with 6.5) will do the job.
Alternately, you could take one object and move its anchor point. Select the next one, and pickwhip its anchor point to the first layer, creating an expression. Select that Anchor Point property, then edit>copy expression only. Select the rest of the layers, then edit>paste. Next, create an expression for Y rotation for the first layer:
Where n is 360 divided by the number of objects. If you expect to change the number of objects, it might be good to use an expression controls effect to tie n to a slider, so you can change n in one shot, without having to change a bunch of expressions, which we will make now.
Select the rotation parameter with the above expression, and select edit>copy expression only. Next, select the other layers, and select edit>paste.
All the layers should now form a ring, where their rotation (place around the ring) is determined by their layer indeces (indexes). Layer 1 is at 0 degrees, Layer 2 at n degrees, Layer 3 at 2*n degrees, and so on.
Note that if you change a layer’s position in the layer stack or place other layers above, its index (or all indeces) will change and so will its rotation value.
Hope that works … I’m not at the AE box right now to test.