I have tried to look back on forum for how this is supposed to work, with limited success.so
My understanding is straffing is when your ship is moving 1 direction and pointing a different direction. You have to install a strafe thruster inorder to do this maneuver.
You move your curser some direction from your targeted ship(s) and right click. (This is the direction you want your ships to move). With the right click depressed, you drag the curser in a direction. This is the direction you want your ships to face or point while moving.
Is this the idea behind straffing?