I'm not sure about cloaking - I'm sure the Emperor's shuttle won't be 'stock' but my understanding was that small-ship cloaking was entirely a result of the Imdaar Alpha project, and that the ability to replicate it got lost. That said, I don't inherently object. My one concern is if a Stygium Particle Accelerator is a bit good for two points on a Lambda?

Cloaking wouldn't impede any of the named shuttle's abilities, but Yorr sucks in stress tokens, which limits his ability to take actions, which renders cloaking pretty useless.

The reason I was thinking improving a lambda's manouvrability is that (as noted) it's the only thing really wrong with it. Give it a white hard turn and it becomes a **** capable combatant.