Get all layers in tree from Geoserver Group Layers

[Khanalweb]

This is by far the best leaflet Layer tree control I have found online. Kudos to you!
I have been playing with it and I am quiet happy with it. Not actually any issue but would be good to have following options-

1. A Method to list all layers from Geoserver's Layer Group(WMS) in the tree. I noticed that when the Layer Group mode is 'single', it gets all the children's style and draws legend.. that is cool! For 'leaflet' type it is getting all 'layerObj.legend'. It would be nice to have 'layerObj.Layer' in 'leaflet' type just like what you have for 'esriDynamic' type. OR a completely new type for geoserver.

2. Option - default 'expand all parents'/'collapse all parents'.

3. Option - default 'check/uncheck all parent nodes'

I would appreciate any suggestions to achieve above mentioned points using your extension.

Thank you!