Toggle brackets & quotes for selection

Currently there exist options to toggle Markdown features for selected text, such as bold via the default hotkey ctrl+b. It would be helpful to have this functionality extended to brackets and quotes. By using a modifier key like ctrl, selected text could be surrounded in () brackets by using the hotkey ctrl+shift+9, or selected text could be surrounded in " double quotes by using the hotkey ctrl+shift+'. This could apply to other bracket symbols and combinations. For example those which are custom defined.