I'm not very familiar with LJ. But in M-PC, I would select my fixtures and position them on the drums. I would then create a Pan/Tilt preset called Drums. I would also create an override cuelist that uses the drum preset. Then anytime you want to position the lights on the drums just use that override cuelist. And if your drums change location on the stage, you can just edit the drum preset and all your cues will update automatically.
Hope this answers your question and enjoy M-PC.