I've played some of the earlier version, and the controls are improving.
One thing that would improve it a lot is multi-select, and being able to move the selected groups around.
Good to know my work is coming through ^^
As for multi-select, it has been implemented. Try selecting a node, then shift-(left)clicking others. You can then move all of them by dragging the first one (dragging one of the latter selections just selects it instead)
I feel it's still kinda weird, and not crazy useful, but it's there.