I had a question from Tony over the weekend (he must have had a busy time rolling out MOM!) and he was asking how some security questions. They had 2 management groups which they planned to connect to the central group using the MOM to MOM product connector and MCF. He was concerned about privileges of the MOM service and which security accounts needed access to which directories.
I had a search on the web, and found this useful guide which documents how to secure the MOM servers and agents which should keep the security team happy.
Good luck with the security meeting Tony!