The reason I started using toggle engine was because, before I got my HOTAS setup, I had no comfortable way to cut my power.  The only throttle I had was on my joystick, but it wasn't productive to move my hand from the view keys on the k'board -- so I just toggled engine on and off.  I had no need to do this after I got a HOTAS.  Leviathn copied me for awhile and started doing it, but I'm not sure why cause he's always had a seperate throttle.  Loser.