If the point here is:
The ability to exclude a specific object from a specific light's illumination or shadow-casting.
(So you have a light, and in its settings you can decide that object A will be illuminated but won't cast shadows. Currently in Corona we can only exclude a specific object from a light's influence completely (so that it is not illuminated by that light but still casts shadows). In Corona it is also possible to disable shadow-casting for a specific object, but this will affect shadows generated by all lights.)
Then this is not something we are planning to introduce.