Hi,
Wouldn't it make sense to move "Sort" groups to right-click menu and rename to "Sort subgroups" (because of "Sort products").
The options could also be re-sorted so all subgroup options are grouped (New subgroup, attach subgroup, sort subgroups), then the separator with all product actions
http://www.screencast.com/t/42ioluyt
Best Regards,
Nuno Aguiar