If you type in a custom off-topic reason, that reason will be available for anyone else to use.  I can't test it right now, but I'm pretty sure multiple custom reasons can be seen if different close-voters type them in.

Here, go to this question: http://serverfault.com/questions/658060/push-code-from-github-to-suppose-godaddy-automatically  Vote to close it as off-topic, and you should see what I just typed in.  But don't select that, pick "other" at the bottom and type in a close reason.