Just a crazy suggestion, the other day when making it to a nebula it occurred to me, why not simply reduce scanner range on all ships inside a nebula to 1k or slightly below 1k? Its not a cloak but it would mean as soon as it registers a ship is in a nebula they go almost totally blind scanner wise. It wouldn't mean you have no hope but would be far more blind inside a nebula or asteroid field, and they would give much better cover in general. Basically, even without the event rule, if you are chasing a ship into a nebula, unless you are right on them, you'll lose them. Pursuing into a nebula would then be a bit more risky. I made it away with a cloak too but I've been cloak CD'd while fleeing too, so a nearby nebula to try giving them the slip would be a cool thing. Also...it will keep you blind until you pop out to take a chance on running, if someone is lurking, its surprise until you'd get out. The only problem is ships outside might have a bit of sight into the nebula.
Example, if a smuggler has a bounty hunter chasing them, and is 5k behind them, normally they may keep chasing, but as soon as they make it to the nebula, the smuggler just drops off. The bounty hunter could try to pursue and hope to catch them near a base or jumphole, but it would change the value of nebulas and asteroid fields in general. I know not all rock fields might be plausible, some could have radioactivity though that would justify it. (then also the notion of a special high powered scanner comes to mind). I'm not suggesting change the event but perhaps it might be good in addition and could keep that sort of thing up after its over.
