I was speaking with Bolt about this very subject back in Bristol last year. My idea was to start the story off as a New Thrill and have a pilot lost in space after doing a random warp jump to escape pirates/his past etc. etc. and he jumps to a planet where he finds the High Rock orbiting a planet and the prisoners living on the surface below having made peace with the indeginous lifeforms and colonising the place. Harry is the leader and everything seems to be idillic, but after a while it's obvious some of the more violent convicts are missing and it comes to pass that Harry has exiled them / emprisoned them somewhere else on the planet. The pilot, using information gained from the High Rocks computer systems, finds his way back to Earth and tells the authorities etc. etc.
I also had the idea of Harry married to one of the aliens and the alien giving birth to his Human/Alien hybrid child who was prophesised to lead the Aliens to greatness, and that's when the Earth fleet turns up to take the convicts back into custody.
The idea was based loosely around the story of the Bounty, with a captain Blyth type figure leading the Earths forces getting in with a rival Alien tribe but with a hidden agenda of stripping the planets resources to help an overburdened Earth.