But if you have, lets say, multiple related images on that Page, those are not copied when you duplicate that Page.

After reading this discussion, i found out that it’s actually pretty easy to “fix” this.

This what i ended up with and seems to be working fine:

//assuming your page has the following related Dataobjects

public static $has_many = array(
'Images' => 'MyImageDataObject'
);

public static $many_many = array(
'Something' => 'AnotherPageTypeOrWhatever

);

The following code would automatically duplicate the has_many related DataObjects
and just set the relation to the many_many Objects on the created page:

..as already suggested in the forum, i still think this would make a handy core feature, wouldn’t it?
Would be cool to globally specify relations to duplicate in the page-config with something like

public static $relations_to_copy = array(
 'Images',
 'Somehting'
);