One of the nicest things and probably one of the least acknowledge piece of any product is the documentation! The Team have done a great job of compiling all the little bits of knowledge in to a seriously good Deployment Guide .chm! The guides are full of information and command line options for what you can do in the 4.5 release of the product! This is just one little element of great work done by the team and a superb reference for us all to use! As soon as you download the RC spend 5 mins ....... well a lot more then that and enjoy the guide!
Check out the SFTMIME Command line reference section!!! That my favourite!