Try to avoid putting the agent into an image if you can. You are creating a situation where the agent will go out of date when patches are applied and also it is too easy for someone to forget about this when they do an update to that image. This mechanism is fine but all too often leads to the duplicate devices you are trying to avoid (it is only one small piece of knowledge that someone needs to forget to cause you lots of prblems in the future).
Mark Star - http://www.marxtar.com
Home of Power State Notifier & Wake-On-WAN for LANDesk