I've been trying out the new SFAS 16 and was very pleased to discover that the old behavior of pressing space to play and enter to pause is back to the way it was. You don't need to press Ctrl+F12 for pause any more. Hitting enter behaves the same way now like it used to.
I added the command to <keyboard.ini> file for AS-15, if anyone is interested in changing AS-15 back to the legacy toggle/pause behavior, AS does not include the custom keyboard editor like SF Pro.