Hiding unused properties from post processing dialogue

[denis_q]

Please make it possible to hide "unused" properties from post processing dialogue. 

Maybe it could be possible by creating a new property: 'visible' to these 'propertyDefinitions' objects?

Here is a another thread about this topic (especially for built in properties).

[denis_q]

supplementary question:

What is the purpose of the property: 'group' from a 'propertyDefinitions' object?