I have not played with Advanced Features, but I might have to try and learn it
My slides are "Scale Response" types, and I'm using it for a version of the NBack task. The reason why I need the slide numbers to be visible is that I need to know at what slide the person is when he or she does an experimental task that is NOT part of MediaLab's presentation but something else they were instructed to do at 2 points during the questionnaire. We were hoping to video-record the session such that only the screen is visible, but it's of little use if I can't tell what trial are they on.

thanks for your response and suggestion of advanced features. i'll try to dig into this.