As others have said, having individual throttle control for each engine does not help you turn tighter. For 97% of the time, having a 'toy' like this doesn't help you at all.
I've found only a few areas where it is helpful
1. Recovering a spin, with practice it will happen instantly.
2. Getting the nose over at the top, in fact is the only case where I've seen a real hammerhead performed in AH.
3. Last ditch manuvers, rudder 70% to one side, aileron 70% in the same direction and cut the opposing engine. It will cause you to fall out of the sky and you can recover fairly easily.
4. Increasing the rate you can move your nose around on the ground. Rudder one direction and cut the opposing engine, I have found that the toe brakes only slow it down and do not help.
I do disagree with AKAK on one point, I don't see much of a difference in chopping both throttles before reapplying. Most of the time, if I cut one engine and I need to reapply fast I will work through it with rudder and opposing engine controls. Maybe it was done in the real thing, but I don't see a benefit to doing it within AH. It just takes a little while to learn to recover quickly so you don't end up like McGuire.