Option for "Continuously Rasterize" switch that isn't also a "Collapse Transformations" switch.

I don't have any active cameras in the precomp, and I pretty much never do. "I'm also not sure why you would want to ignore the comp camera in a complex 3D scene." - I don't.  I'm just saying that I don't want continuous raster and collapse transformations to be the same switch - I don't understand why it is

A pre-comp (nested comp) with 3D layers uses the main comp's Active Camera to show 3D layers, not the Active Camera in the Pre-comp. If you need a camera in the nested comp for making adjustments to the 3D layers, you can create a duplicate camera and tie it to the Main Comp's camera. I know it's a funky workaround, but it will work.

A better approach is to never include a camera in a pre-comp with 3D layers. It's the same with node-based systems, you just have to stack things up in the correct order. I'm not sure how you could do the math to rasterize vector shapes and ignore a camera in the main comp. I'm also not sure why you would want to ignore the comp camera in a complex 3D scene. 

Could you share a workflow where 3D objects need to remain 3D and not interact with the camera? It might help us understand the problem you are facing with your designs.