By the way, for the Maniac engagement in WC4, there is a kind of cheat. Since the AI flies in formation, you just come to a stop, and turn to face him. The second you accept the challenge, ping his shields and give chase. You probably won't kill him, but as long as he doesn't hit you in return the little bit of damage you get from that sneak attack is enough to rule you/Blair as the winner of the timed engagement.
There's also a little bit of a joke you can play on Seether, in the engagement in Sol system. After he taunts you, but before he actually attacks, if you hit autoslide and turn around (so you're flying backwards), when he does start he'll appear behind you... and run right into your rear, destroying his ship. You'll take some damage, yes, but he'll be outright destroyed. If you fly through the defending Arrows around Earth itself while cloaked, you won't be attacked, which will keep your damaged ship safe till the atmospheric entry cutscene kicks in and takes you to the final conflict of the game.