I was actually wrong. It does support importing bulk quizzes but the process is tedious but better than using the regular one.
Go to http://esltutor.net/quiz-converter/ It has a template. Fill everything. The instructions are on the right side. What I did was to create one quiz in a textpad and use it to create multiple items and then paste them back into the converter and generate the xml file and import it. Once imported, you will find that none of the options that you selected above the actual paste area will get imported into wp-pro-quiz but quizzes themselves will get imported fine. Let me know how it goes or if you need more help.