[racket] timed auto-advance for PLT slideshow?

I'm giving a talk (google-ignite-style) where the slides are supposed to auto-advance every 15 seconds. I don't see any support for this, and it looks like the easiest way to hack it in is just to modify the viewer so that it starts a thread that sends itself "next slide" messages every 15 seconds.  Am I missing something obvious, here?

thanks,

John

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