Linked Pages - automatically include any new child pages created

You would have to create a global event handler for this to happen. There is nothing out of the box to do this. Your event handler would have to do some lookups of the following fields on the CMS_Tree table. I don't know the exact query or process but based on these fields and doing some queries in the database you should be able to get your code worked out.

NodeID = unique ID per content tree node
NodeParentID = parent content tree node of the current document
NodeLinkedNodeID = node ID of the page this node was linked from
NodeOriginalNodeID = node ID of the original node this page was linked from. Meaning if you created a linked page from NodeID 10, which then created NodeID 20, then you created another linked page from NodeID 20, it would have NodeID 10 in this field.

Clear as mud? Hopefully this gets you in the right direction.

:) Ok, thanks Brendan. That gives me something I can work with. I think that would probably work. I hadn't thought about global events.

You could do a scheduled task but I think that would be kind of messy because you'd don't want to check all the pages every time, just the page that is created.

Yes, I thought about that when I was replying to your answer - ie Schedule vs Global events.

I had a similar issues and this is my solution. It seems to work fine. You only need to take care of the insert event because deletions are already handled.

public AutoDocumentUpdateModule() : base("AutoDocumentUpdate")
{
    DocumentEvents.Insert.After += InsertOnAfter;
}

private void InsertOnAfter(object sender, DocumentEventArgs e)
{
    var node = e.Node;
    var parentNode = e.TargetParentNode;

    if (parentNode.NodeHasLinks)
    {
        var linkedNodesToUpdate = parentNode.Links.Where(c => c.NodeID != parentNode.NodeID);
        foreach (var nodeToUpdate in linkedNodesToUpdate)
        {
            node.InsertAsLink(nodeToUpdate);
        }
    }
}