Hi,
Thanks for the interest in our plugins. I can answer your questions.
It depends on your server how many Page IDs you can run. A good server can run more then a shared hosting.
I have about 40 or so running for tests and it works great.
Facebook Imported Events look like regular Events Calendar Events so it would look like this:
http://wpshindig.com/events/list/
Pro does has a Photo View, which is pinterest like, but we do not have shortcodes or a feature to use in on the home page of a site.
Let me know if you have any follow up questions.
Thanks