Another idea for pirates is "privateers" which are basically allied pirates. Pirates in your territory that don't hurt your ships but prey upon enemy systems... then run back to your systems to sell their booty, repair, and rearm...
You stole my idea! I was just going to post that!
So it may come as no surprise that i too like it.
I would actually love if a host of indirect warfare options where added.
Where's the spies with the ability to temporary disable certain structures in a system?
That causes local unrest, that makes all your production somewhere temporary slow down to a crawl?
The mine layers that let you booby trap space lines?
Spy drones to attach to other players merchant ships?
Elite Storm troopers that could possibly take over enemy ships?
Cheers