It would be extremely handy to be able to select all or deselect all layers when configuring the Layer Widget. When grouping layers, we want to choose which ones will be in the group/layers list. If we have a lot of layers and groupings, it is extremely time confusing to turn all of them on or off in each layer widget/group.
Also! How do we ensure that a layer is not automatically added to the layers list if/when new layers are added to the map? This should be an option. Then we don't have to go in and edit each layer list/group every time a new layer is added to the map.
