I tried out Lightning Reflexes on the Kihraxz and would almost always take it over Crack shot. Crack Shot is only valuable if you can take a ship off the board using it (I.e. Defensive via offence, bear in mind this effect can be cumulative across several ships or shots), but it also doesn't add to your unpredictability which means you risk being killed before doing sufficient damage to earn your points back.
The biggest issue I had with Kihraxz was the lack of a 1 straight makes some maneuvers in tight very difficult to pull off. If you want to go straight you are forced to close too fast, if not your attack of attack changes quite a lot. While the 5 K-turn is useful, you don't often want to get that far away. Lightning Reflexes forces your opponent to keep account of it for what you can possibly do (same goes for Inertial Dampeners). It significantly increases the unpredictability of the ship in a similar way to post manuever actions, but forces opponent to make decisions during their dial set up. Often the threat of pulling off a LR is enough to force your opponent into poor moves.
I tried it with Glitterstim, but I am now tempted to run some Black Sun Aces with LR and Inertial Dampeners to see what kind of shenanigans I can pull off (or not). 25 points seems like a reasonable deal for such unpredicable ships.
