You may be right for your style of swing. It was just a suggestion that's helped me. Just thought I'd throw it out there. You see a lot of modern day golfers (i.e. Anthony Kim, Camilo Villegas) do this very well. You don't necessarily have to shift any weight doing this it's just that straightening your right leg might cause a lot of movement that can mess with you. I know it sounds funny but it's what I've been told.
Although this is a very poor shot it shows Villegas doing this really well. It shows a swing vision about halfway through. He does have a lot of sway, however, so I prefer watching the second video.
This is a second video of Anthony Kim.
These are two very athletic golfers with very modern day golf swings. Other examples include Adam Scott and Tiger. Try comparing them to your swing and see what you think. It's up you you to make the change or not. Hope this helps in any way.