Hidden docs should have hyperlinks automatically generated for hidden child documents, see the 1.6 and 1.8 hidden docs don't link to other hidden docs thread.
The code that generates the links to showable documents is this in flo/Editor.pm:
# plus we want to hyperlink all the children foreach my $child ($document->children_showable) { push @links, { class => "mkdoc-name-". $child->name, href => $child->uri, desc => $child->description, expr => $child->title, lang => $child->lang, } }
I guess it needs wrapping in an if that does, if this is a hidden document then link to all child documents irrespective of wheather they are hidden else only link to showable documents.
This will be a bit more complicated for 1.8 because there shouldn't be automatic links to versioned documents…