Outline text box tool / Text border
Research shows a text box with a border enhances the readability of text.
GG provides the polygon tool which can do this quite well; however, it would be nicer to be able to click a property box in the individual text box property window which would add this to the current text box.
Please consider this request in the future of GG. It will assist in construction and pedagogy.
It would accent the background color selection currently available. Do not require both to be the same color.