template wrapper width

Hi, great plugin, thanks for it!
I see that it removes all template settings.
Is it possible to keep only the template width settings?
Like lets say that my template is define to wrap content in a max of 1240px wide. I would like to keep that, so my text wont start whithout any margins of the left and would not touch the right side of the page… But I would have to still be able to set a full width row widh an image or color background as well…. but the content would keep the 1240px wide.

Is is possible to have this?

thanks