I am told this would be a hard script

I'm looking to figure out a l2walker script that could detect trigger Dagger Mastery and use a lethal blow right after. I was told a buddy that this would be a difficult script to make because the trigger is random and we weren't sure if we skill id was the passive or the trigger itself.

He doesn't believe its worth the work but halfkilling greenspot mobs with 2-3 daggers in group makes a HUGE difference. Anyone tried anything similar with it or what?

Still nothing? no daggers would be interested in this? I think if its doable it would make high hp ie hellbound mos etc so much easier to handle.