Making SimCity for Mac run at full resolution of 2560x1440 on a 27" iMac

After spending ages on the phone to support, they finally came up with a working way of forcing SimCity for Mac to use the native resolution of a 27" iMac.Right-click on the game in Origin and choose "Game Properties"and then type in:-r:2560x1440(You can change this to any resolution you like) On my 27" iMac it runs absolutely spectacularly at this resolution.