Because a list prop is still a Traffic Variable, it is subject to Traffic Variable specifications.
If you segment a list prop with hit container, the server call variables bound to the prop value will only be shown i.e. You only see visitors and behavior on the pages where the segmented list prop is available as you said.
To group certain pages in your site, you don't have any option than to segment.
In Workspace, rather than segment you can manually group the pages by dragging the page names and drop the same in the modules.
Quick question though, by manually dragging and dropping the pages into a freeform table you have to mark them in the dimension list before dragging them into the freeform table right? You cannot add one page at the time into the freeform because you are only able to replace or breakdown?