Not sure if anything has progressed with this. I agree it would be very useful to view multiple components and their cameras simultaneously. But if the components overlap they may be hard to distinguish from one another, selection can also become tricky if using lasso type tools.
Viewing two or more components simultaneously can be achieved another way. By supporting 3d viewers which can each display a different component. A layout with multiple 3d viewers would allow different components to be examined side by side. Any selection activities would work across multiple viewers.
If such 3d viewers are implemented it would also be useful to be able to lock the 3d viewers cameras so as to move and rotate in sync. To lock (synchronize) cameras or unlock (allowing independent camera control) would just be a toggle.