Here's the solution I use: I initially create all my quizzes offline in my word processing program (WORD for me) and then copy them into the Quizzyland template when finished. I use the same file (separated by a page break) to create quizzes that have multiple generations of a basic theme (like Movie Quotes I, Quotes II, Quotes III, etc.). Most word processing programs have a "Find" function that would allow you to quickly check for key words in your previous quizzes to see if you've used that one before. An added bonus: spell checking your quiz before posting.
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Life is what happens to you while you're busy making other plans -- John Lennon