The following ITM Best Practice documents are published in ITM Wiki today. The both documents cover ITM security configuration best practices. If you have any feedback, please let me know. Hope this helps.
Creating a Highly Secure IBM Tivoli Monitoring Agent Configuration
Configuring IBM Tivoli Monitoring version 6.2.3 Infrastructure and Agents for FIPS 140-2 Level 1 Conformance
Manager, IBM Tivoli Monitoring Framework Development