This seems to be a limitation of Acrobat X and XI - you may want to complain to Adobe about this: https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
In Acrobat XI, you also don't have the ability to just use a comma separated value list anymore.
You can accomplish what you need to do with JavaScript - such a script could analyze a CSV list of filename, followed by the list of page numbers to use, and then combine the pages from the listed files into a new PDF file.
This approach would require you to create a JavaScript solution. If you don't have a JavaScript background, there are a number of people on this site who can help you with such a project (I would be one of them - if you want to get in touch with me, my email address is on my profile page).
Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...
http://www.khkonsulting.com