It would be great to be able to perform general operations on multiple selections of groupings, groups and members.
1. Select a grouping. It has 5 groups
2. Select all 5 groups -> All the members appear together in the members select box
3. Click a new Remove button that directly removes all these members from the selected groups
Another example with same steps 1 and 2 as above:
3. Click Delete Selected Groups (the button gets pluralised, or has (s) at the end)
4. The confirm delete page asks 1 confirmation for all selected groups (could also show the members that will be removed from these groups as a consequence)