Doing the above with 'auto' on you don't even have to press the "Q" key to open the tube doors for when you press "Fire" the door/doors will 'auto' open. ( well you lose about 2/3 seconds maybe ? ) Never had a miss yet

Except for those darn DUDS.
And if the weather is nice you could try this

Providing no one else was around to blast you.
I said "Providing" no one else was around.