From 2.0, Shift-Click for multiple icon selection function on map editing was deleted. Windows and Linux users use Control-Click instead.
However, Control-Click operation shows popup context menu on Mac by default. (see attached screenshot), so Mac user cannot select multiple icons using key-mouse combination on 2.0.

Normally, Mac application using Option+Click (same as Control-Click on Win/Linux) or Shift-Click (same as Shift-Click on Win/Linux) for multiple selection. I think it's better to support Option+Click operation for Mac users.