Size property within the 'Properties' window for Null objects

I'm suggesting the null object to have a size property. This will give us the flexibility to use the scale for actual scaling.

Use case:

I have four elements, and I would like to scale them equally two by two by 20%. I'm creating a null for the first pair and another null for the others. Now, I'm resizing the nulls to match the visual footprint of the elements. At this point, I'm unable to scale both pairs equally, because both nulls have completely different values for scale.