Feature request: allow for parentheses or brackets to be added to any element

Feature request: Allow for parentheses or brackets to be added to any element of the score.

Currently, as far as I know, parentheses can only be added to accidentals and notes (maybe one more thing or two).

Why this is important: Scholar and Urtext editions commonly use parentheses or brackets to indicate elements that are added or suggested by the editor rather than by the original source (e.g. manuscript).

Current workaround I know is to type parentheses in a text element and place it manually, which is horrible at least because any layout change will potentially break it.

There are some request here and there to allow parentheses or brackets to be added to elements other than accidentals and notes. This request is for a really universal and definitive solucion.

Possible implementations:
a) as a toggle in "Properties" (former "Inspector"), with an selector for "parenthees" () or "brackets" [];
b) as a palette item;
c) as a toolbar button.