The sandbox project is a temporary fork of Multi Node Edit to provide edit "child" nodes of a child-referenced parent node support. Apologies for the confusing project name (similar to original) for your convenience to make local path in Version tab Git instructions more straightforward. It is the intent that this sandbox code eventually gets folded back into the multi_node_edit module.
When your node relationship is Child -> Parent, and each Parent can have multiple child nodes referencing it, there is no back-relation from the parent for this module to latch onto. As I work to add support for that, I'll update the documentation here...
How to use it
Download multi_node_edit and enable it and its submodule multi_node_irreference.
Click Edit on a node that has children: A new sub-task tab will show on the Edit screen to edit all child nodes pointing to it, separated by content type.
Progress:
Stubbed out a new submodule multi_node_edit_irreference (this sanbox)
Produces LOCAL_MENU_TASK menu items for each content type that has at least 1 node referencing the parent on a parent node's Edit page to access the mne form
mne form presents all nodes of a content type referencing the parent nid passed in