I have done two of the four missions on expert on single player. IMHO there is room for hacks for this game, it's simply a matter of raw single player fun and achievement.
Trust me, I have dropped a ton of mega F-BOMB ridden rants as I tried to get to rescue, but for me that's what makes the game so damn good.
We can all relate to "for fucks sake, I was ripped off, I am never gonna play this piece shit of again, stupid ass fucking game, screw this". Then 20 minutes later you playing again, now that's a good game.