When there are multiple objects on the scene it is very hard to edit support for precise and complex objects that may be hidden. It would be really helpful if selected objects could get ghosted / wireframmed / toon-rendered on order to access other parts internals and edit their support.
There is Cross Section View operation, but it does not allow to define custom angles such as X-Y-45-degrees, also it only allows to preview the section but does not allow then to select anything in order to edit the support. Thus CSV is partially helpful but only for preview not edit.
When object is ghosted then its alpha translucency allows to see what is on the other side behind and select that object behind and its items such as support to be edited.
That would allow to fine-tune support for a several parts objects to be printed together and then put together into one solid casing.
At the moment it is not easy to edit and fine tune the support for a multiple objects on the scene as their elements may be covered by other parts.
Why fine tunning of the support is important? Manual edit of the support is already here. Automatic support generation is fine as starting point, but then, some of the support elements gets into fragile mechanics of the design and disturbs it. Such support that aligns with some fragile mechanics is then hard to remove without breaking the part and on the other hand it does not allow several parts to fit together. This is why sometimes we need to cherry-pick and remove some of the support pillars that would eventually break the final result.