Would it be possible to add an Expand option to the Model Layer component please?
I see this more as one component of a new set of components that allow you to interact with Rhino UI.
Something like ‘Layer Panel’ component that allows to expand or collapse layers or even sort the layers.
In the same set of components we may have ‘Select Model Object’ to control selection and ‘Active Selection’ component that allows you get and set the current selection on the UI.
But this will not be part of 8.0 
Maybe on an 8.1, 8.2…