[launchd-dev] SMJobBless and plugins

Hi, I need to run an authorized tool from a preference pane. Actually, SMJobBless sample code explains how to install and run a tool from an application but it seems to me that it can't work for a plugin. A workaround I can see is to ship the preference pane with an installer app that contains the daemon. But I have no real idea of the security concerns of such a design. Any hint ? Thanks in advance JL