Speed matters noticeably less if you're playing a Star League-style ship with bracket-heavy broadsides. If your goal is to stay at Long or Extreme range as much as possible, you can set a course along your edge of the map(or kinda close to it, you still want some room to maneuver if/when the other finally gets close), and pound away as your opponent tries to close.
Obviously high thrust is useful in countering this, but there's limits as to how fast you can go, due to the need to not fly off the map edge.
A big thing to remember is that angle of attack modifiers are based off of course, not facing. If you're flying sideways relative to your opponent, it doesn't matter which part of your ship is actually pointed at them, they've got a +2 to hit you, equivalent to a full range bracket. Very useful to keep this in mind when you're rotating your ship to bring fresh armor to bear.