I now have culling back in, sadly even after finding an extension for occlusion on IOS. I think its only available on iPad2, I just couldn't find any info on this... so here's what I added.

iPhone/iPad

• Frustum Culling
  

Mac OS X

• Frustum Culling
  
• Occlusion Culling
  

Frustum cull is just a given with both camera and light objects, to add occlusion all you need to do is add the Occlusion pass before your render scene pass.

Image shows the Occlusion in action, large cube set as Occluder hiding a smaller cube behind it.. Console shows the results.