As well as what everyone else has said, i would think it might be handy to have game templates. Sure a lot of experienced people wouldn't need them but it would ease newcomers in quite well.
Perhaps a better tutorial system as well - the MMF2 included tutorial is okay but is very basic. Tutorials for several types of games or applications could be included to teach whilst the user gets to do follow along. I don't think new users should have to go to youtube to learn the basics really.