'Nest in groups' options slide

I thought this would be the best place for a feature request.

I am setting up FlexiAccess with user groups to match my category structure.
I am taking the view that the most efficient way to add users to a layered structure of groups is to add users to the highest level only, and then use the nested groups feature to cascade their permissions down.
I am also taking the view that the easiest way to add layers of groups is to start creating groups on the most general/lowest level, and then add groups on increasingly specific/higher levels.
So I am creating groups, and when I have created the groups for a level I go back to lower level groups to nest the higher level groups. Then when I finally make groups to which I add users, again I have to nest those groups. That seems to be the most effective way about it.
I know I will have to add groups later. I am making a restricted access website with documents and information for corporate customers and in the course of time customers will be added. Then, again, I will have to go to one or more groups of lower levels to nest the new groups.

In the course of all this, I started thinking that it would be nice to have a third slider with options, under 'Nested groups', called 'Nest in groups'. In that slide I would like to have options similar to the 'Nested groups' options but then for nesting the group being edited into groups selected from a list.

I think like that it would be easier and quicker to nest groups. Also I think it would be easier to train people how to use FlexiAccess.