Allow us to create a group of items, and save it, sort of like creating a new custom object, or a code snippet. This would also require the ability to move the group as one, and for objects altered with the "Move" tool to not loose their rotation and alignment in respect to the other items in the group. We could have a personal library of items we've grouped together, and maybe share them with other players?

Things this would permit with ease:

Bowls full of fruit

Fireplace grills

Custom furniture