You can put on the blog posts game you would like to see come to the IGC. But there is no specific way to vote for games to be put into the IGC. ANd askign isn't guaranteed to make it happen.
It's basically whatever company wants to give Sony their game for free in hopes of DLC sales, makes it happen. So what tends to be on the IGC is old cheap titles that have lots of DLC.
Chat with a PlayStation Specialist
Mon - Sat, 6:00AM - 10pm , Sunday 8am-8pm Pacific
Consumer Services and Technical Support____ 1-800-345-7669
Mon - Fri, 8:00AM - 8:00PM Pacific
Sat, 7:00AM - 6:00PM Pacific
Playstation Network Accounts and Billing Support____1-877-971-7669
Playstation Forums Support MVP. I do not work for Sony. Just a helpful gamer.