I have done it this way all the way back to MY90 Legacy LS wagon. I put a pipe on the end of the breaker bar and lay it on the ground toward the drivers side. Hit the key once real quick and VOILA ... hand loose.
Since then I have used this method easily more than 50 times ..... want to say over 100, but that may not be true. For my own and other Subarus I help take care of.
Works equally well on Manual or Automatics ..... now to re-torque, Manuals are easier ....... 5th gear and parking brake on. Then torque to 140 ft lbs. Automatics, I have someone HOLD a large screwdriver in the Access Hole behind/below the throttle body.
98S, 2014 Impreza 5 dr Ltd (9 Subaru's since 1978, 7 were 5 sp) ILuvSubaru's