regarding Plugins on Build Server we currently only mention the usage in the deployment guide: http://v-play.net/doc/vplay-deployment.html#config-json. In order to link against a specific plugin you have to tell the Build Server which one with the help of the config.json file in your game’s qml root folder with an additional line:
"plugins": [ "flurry" ]
You can also have a look at Squaby’s config.json file for reference. The documentation of the upcoming update will point that out in more detail.
Thanks for pointing out the error in Qt Creator, we will check that, I guess you’re currently using SDK version 1.2?
And finally, yes, you would have to prompt the user and then set user age and other demographics by your own if you want accurate data about your audience, otherwise Flurry tries to fill the data automatically with “Flurry Estimates”.