You can wither generate or import a SSH server key, and (new in v4) you can now also export the server's public key for those users who require it to verify your virtual server's identity.
The Software ID and Greeting message fields are now parametric.
For example you may type a Greeting message like "%SWFULL% v%VERSION% ready!" and, upon connection, your server will send "Syncplify.me Server! v220.127.116.11 ready!" to the client.
For a complete explanation of all possible variables to be used in greeting messages, see this KB article.