Whenever Extreme Motorsport oil changed my last Impreza I asked them to disconnect the crank sensor - it takes 2 minutes - although they did not do it automatically - thought there was no need like many people. Also, my current car has not had that done but, due to the engine being so "special", I want to get this done in future. Has not done it any harm thus far mind you (that I know of) but better safe than sorry. It won't worry me asking to have this done (if its' in a garage) just to save a little "oh you don't need to do that" etc...the reply would be "no, but I'd like it done thanks []"
And I'm sure AWD would assist in doing this if the customer wished.
Brian []