I fully support requiring players to play at least one Beginner game before they can play Standard games. If you watched my game, Lord of the Flies Mafia, you will remember how swamped it was with new players. In a partially experimental game, I had to give important roles to some untested players. While some of these new players played well, many were inactive or made terrible descisions. If the players in any experimental game play badly enough, they put the whole experiment in danger of failing (although thankfully mine did not). This is why the Expert division was created, and it applies to Standard games as well. To avoid having bad players ruin Standard hosts' experiments, it would be best to require new players to play in Beginner first.
I also agree with UncleSam when it comes to changing the game maximums to two Beginner and two Standard. To add to what he posted, it would improve the quality of not only the players in Standard games, but also the hosts. Most of the users who have hosted Beginner games have been new hosts who want to get into hosting mafia. Increasing the number of Beginner games would give Standard more hosts who have already hosted games rather than jumping right into hosting Standard games.