Hey there Mark,
I’m not representing theme authors so I can’t really say anything regarding adding such options.
However, you can apply the same code and use specific page ID selector to make this to work only on those pages. To do that use developer tools to inspect element on pages where you want this and once you do you’ll be able to see the page ID in the body element, see screenshot https://screencast.com/t/aYBk1LfJnfi.
So If you want for example to do that on that page (from the screenshot) your code should look like this:
.page-id-2 .sidebar {
display: none;
}
.page-id-2 .container_24 .grid_16 {
width: 100%;
}
By doing this the CSS will be applied only to that specific page. If you’re unsure how to do this please post link to the pages where you want this and I’ll help with providing the CSS.
Hope this helps ??
Cheers,
Bojan