Just as a note if development goes on (which I'd welcoe as the module is so much simpler than tmgmt): it would be great if this module would become compatible with entity_translation.

For now, it seems to only work with translation done with the "Content Translation" (translation) module. Since the translation and entity_translation mechanisms do not conflict with each other when not used on the same content types, Translation Overview could just list all the nodes and their translations, regardless if they are handled by either translation or entity_translation.