I've just committed version 0.8 sources of Light Wolf Eclipse plug-in. It was simpler than I thought when I posted the previous entry. The plug-in is very simple and have no UI, but it effectively removes the need of an Ant task to instrument flow methods, and thus makes development very easy and natural.
I'm managing to publish the plug-in's update site by the end of this week. I hope everything goes fine so I can accomplish this. The current plan is to add support for Eclipse 3.3. Let me know if you need support for an oldest Eclipse version.