How do I disable Auto Save and get the Save on demand functionality back?

What the title says.  I don't want every little edit I make to a test case to be saved automatically.  Sometimes I make a number of changes that I decide I don't like and want to not save what I have.  I don't want to have to make a new version every time I want to make a few edits, just so that I have something to roll back to. 

Is there a way to disable auto save and get the Save button back?