Is there a way to add groups to existing groups to create a sub-group hierarchy? Google apps for work has this and it is very convenient. If it is not an existing feature, I think it should be.
An example where this feature is helpful is for creating a group for an entire company where each entry is another group that contains a specific department of the company. If I have 10 departments in my company and each department has 100 employees, having a group for the entire company would entail 1,000 entries - something that isn't practical or realistic to maintain.