Hey I jsut came up with an idea for a new component, maybe.
Its a storm generator, but it moves with the ship
The storm would have to be a sensor interfeering one, so unless you'd noticed the storm, you wouldn't notice it moving towards your homeworld. . .
Maybe you could have a 'monster' that was just a storm that moved from system to system.
Maybe you could have a 'monster' that made its own warp points, this would be great for earlier stages of the came with less tech, yuo could follow the monster around as it passed from system to system, (closing its path behind its self).
Which leads me to another idea.
Warp points which only stay open for 'x' number of turns when you open them. Ont he first turn its a strong WP, then it gets weaker, and weaker until it just disapears. . .