Not sure if this is the correct way to submit a feature request… but…
The usefulness of the parent/subgroup structure could be better. As it is now, it appears that subgroups only serve as a visual aid and nothing more.
When working in reports or device filters (for example), I would love to be able to select the parent group and have that instantly include the subgroups in my results. Right now I am required to select each individual subgroup.