Page Specific Sidebar Option for Custom Pages

Would it be possible to have an option on each individual Page to choose whether the sidebar is shown?

Something like a simple “Enable/disable Sidebar” option when creating or editing a Page would be really useful. Some pages work better with the sidebar, while others, such as full-page content, would look much cleaner without it. At the moment this seems to require custom CSS or JavaScript.

Having this as a built-in Page setting would make things much easier and give us more control over how individual Pages are laid out.