I was going to post this on the bug report, but I decided to not to, maybe I am just seeing things...
But here I was testing my mod, and I forgot to enable "hide" console command.
Then I see a pirate trying to get me, he enables burn drive and... start to zip around the screen like a bee on crack, he wasn't just moving at burn drive speed, he was moving at about burn 30 I think, and making some very sharp corners...
when it managed to engage me, it was a group with only destroyers (no frigates).
I wonder what was that.