You may be able to write a post-exec script using the environment variable SESSIONID, but, I couldn't tell you how to send an e-mail from the command line in Windows, or how to script this
THe 'omnirpt' commands only give you the ability to generate most reports for backup, and, I guess that the 'single_session' report might work for you, but, it is a matter of gettign the session ID from the session into the 'omnirpt' command
Any way that you look at this, it is going to be difficult. You may want to think about making an Enhancement REquest from this URL