Question in moodle have one useful thing: you can open existing question, edit it and save as a new question.
The same thing would be quite useful with the modules, as users often need several activities with similar settings. But module editing form lacking such button
It would be easy and useful thing to add it. Improvment request is MDL-18093.
Also please note and comment more complex improvments mentioned on http://docs.moodle.org/en/Development:Linked_activities