Best Practice: Using full width

Issue Summary

Hello,

I am creating a Slideshow that is supposed to use the page's full width (960). When I put that slideshows' block on the frontpage it is rendered inside a div (#region-content) with the class .grid-12.

That class is limiting the width to 940px instead of 960. I understand this is for the margins which I do want on the other content. But for style reasons this special element should use the full width.

What would be the best practice here?

Of course, I could add another class to that region overriding the width. But that does not feel right since it would create the exception for the whole region no matter what content it has.

I would love to have the ability to create an exception based on the contents context.

Any insight welcome.

Thank you