Sadly, a cruise disrupter counts as a full attack. It's stupid, but if you fire a cruise disrupter, engage cruise, then cruise disrupt him again, it's reengagement, but it's more of a technicality than a real rule..
Quote:*For purposes of these Rules, an attack is draining shields to 50% or lower, or hull damage, or when a Cruise Disruptor is fired. Intentional ramming of any large ship is also considered an attack.