Did you ever find a solution?
No, not yet...
I think I found some solutions on another site -
http://www.connectusers.com/forums/cucbb/viewtopic.php?id=960 - read the bottom posts from 9-23-2009. Looks like there are two possible solutions, though I have not tried either. I am trying the Flash button approach (second suggestion) today. Will let you know if it works, but sounds like it would.
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I wanted to post an update that the Flash button solution worked beautifully. I was able to create a single button template to use at the end of multiple presentations by passing in a URL variable to the imported flash object. You can add the url variables that you want to get to the swf file embedded in the ppt by adding them to the /[your pres name]/data/viewer.xml file. Just locate the slide that has the embedded content and you can then attach the url variables.
Of course, you can also just hard code the link in your Flash button file, but then you would need to create a new file/swf for every presentataion.
Hope this helps you.