we should have pm's(private message).we can use it for notification on our game submits. Also,players can send messages and any inappropriate content can be reported.
If you scroll down to the list of Common Suggestions, which is at the end of the first post, there is a section labeled profile. The fourth suggestion up there says Private messaging. Be sure to look over these common suggestions before suggesting something to be sure it has not already been suggested in the future.
Other then that I think PMing is a good idea, and I don't know if they plan on adding it in the future at this time.