Filtering/Blocking Specific User Agent in TC Server

Hello,

Hopefully this is being posted in the right forum.

My TC environment is the following:

Server version: Apache Tomcat/6.0.32
Server built: February 2 2011 2003
Server number: 6.0.32.0
OS Name: Linux
OS Version: 2.6.32.29-0.3-default
Architecture: amd64
JVM Version: 1.6.0_24-b07
JVM Vendor: Sun Microsystems Inc.

I was looking to see if it was possible to block/filter a specific set of User Agents within TC 6.x? I've been able to find some information about "org.apache.catalina.valves.CrawlerSessionManagerV alve" in TC 7.x, but haven't been able to get any details if this was possible within TC 6? If so, what configuration file would I need to modify

Thanks in advance