McCaw was speaking at a World Rugby question and answer session and said the loss of game time during the lengthy scrummage delays should be countered by stopping the clock.
"One of the things I get a bit frustrated by is the way a scrum can eat up a lot of time in the game.
"If I was going to change something it would be to stop the clock when awarding a scrum and it starts again when the ball comes in. You'd get quite a bit more rugby," he said.
His view is backed in part by top referee Nigel Owens who also believes crooked scrum feeds need to be dealt with.
"Of course, we all, as referees, can always do better, but it's not the referee who collapses the scrum and it becomes the referee's problem if we don't deal with the issues that cause the collapse.
"If we want referees to blow up at every single technical issue then we won't have a game and we'd have 50-60 penalties a game," he said.
McCaw also revealed he would not be following former rival and Wales captain Sam Warburton's lead and getting involved in coaching. Warburton has become part of Wayne Pivac's Wales coaching group.
McCaw said, "I think I'd just get too frustrated.
"As a player I could get out there and do something about it. But when you are a coach I think you have to have a different way of looking at it. But I'd like to coach young kids one day," he said.
Meanwhile, walesonline.co.uk has released its top 50 players of the year.
Springbok Pieter-Steph du Toit was rated No.1 ahead of Fiji's Semi Radradra, South Africa's Faf de Klerk and Wales' Josh Adams.
All Blacks on the list were: Beauden Barrett (5), Ardie Savea (8), Richie Mo'unga (10), Brodie Retallick (18), Kieran Read (31), Aaron Smith (46), Jack Goodhue (48).