This is a feature request.
When making lists, bar-separated lists of pages are accepted into the primary field (e.g., "What links to:" for the "What links here" source). Sometimes I will make a list in the regular "Make list" or the "List comparer" that I intend to use in this capacity. However, to achieve this, I have to copy the list to a file, then replace CRLF's with a bar ('|').
I recommend what I think is a simple solution. Have a "Copy as bar-separated list" context menu option for all lists. It would work like Copy in that it copies the list to the clipboard -- the only difference is that CRLF's are replaced with bars before copying.