Actually it's easy to deliberately fumble out of bounds with 100% garauntee that the other team wouldn't recover. It revolves around the lateral pass, as we saw in the Pats-Jets game. A pass backwards (lateral pass) is considered by the rules to be a stretch handoff, that's important because if it isn't caught that's a fumble (live ball) rather than an incomplete pass (dead ball). Subsequently if the rules were as you interpret then all a team backed up to their own endzone would have to do is have the QB throw at the back pylon, since the back pylon has to be behind the QB it would be a stretch handoff and therefore when nobody caught the ball it would be a fumble, a fumble that would go out of bounds. With the way the refs, correctly, interpretted the rules that's a safety, with the way you're trying to interpret them that would be a touchback.
Maybe. But if you deliberately fumble the ball out of bounds, or the QB throws it out of bounds HE is the one providing the impetus. In this case the impetus toward and over the goal line was provided by the Seattle player.
ML/NJ