Better Grouping in Shape Layers
Grouping can be improved, by grouping the selected items automatically in a Group, in stead of adding a Group (= a folder) and then drag all items in there.
Furthermore, I would the Group to automatically update any involved expressions. Currently expressions are broken by changing Shape Layer hierarchy, and have to be repaired manually.
Good news: if you right-click on a set of selected shapes, the latest version of After Effects will show a menu that will enable you to group or ungroup them automatically. You can also press CMD+G. (The shortcut works in older versions, too.)
Updating expressions to match is a good feature request.