So, what are your favorite unusual specialist maneuvers? They should be somewhat efficient, but barely worth the effort it takes to set them up. To start off:
Smuggler-Free Smuggling
You can use a Pirate as an almost-as-good Smuggler if an ally is willing to help you out. Have them send a sub near your destination (a friendly outpost) that you can intercept with a Pirate. At best you can get there in 3/8 normal travel time, if the intercept is just over halfway between the locations, so it's always worse than a Smuggler. But, hey, it's something for your Pirates to do when they're otherwise unoccupied, and sometimes that little bit of time is worth it.
Navigator-Free Martyrdom
You don't need a Navigator to pull off the unstoppable (except by Pirate) Navigator+Martyr combo. You just need to find a line segment between your outpost and an ally's outpost that passes close to an enemy mine. Send the martyr along that path and get your ally to launch a single-driller sub in the opposite direction at the right time, so they meet within the blast radius of the mine.
I've used the first trick a few times. I haven't found an opportunity for the second one yet, but I'm sure it'll cost me some friends one day.
What are your favorite janky maneuvers?