Am I misunderstanding something here? You want a car driver to pull into the outer lane so that you can undertake him between the cycle and car? I'm a biker and that sounds suicidal to me. The drivers next move would be to move back into the inner lane, right into you.
I've got no problem with your complaint about them half-changing and blocking both lanes, it's the concept of nipping between them, knowing full-well their next move will be back in.
I thought this too. As a cyclist I'd be absolutely terrified if a motorcyclist did this and I've never experienced such a maneuver. Bikers are generally the best behaved around cyclists.
Yes, I can see that. It depends on the circumstances if I consider it: if there's a bit of a caravan/peloton/group of bicyclists, then it's more useful. If it's just a lone pedaler then the car will move back and zip forward since it will not have an unobstructed lane, so there's not point in trying to get a head.
I've got no problem with your complaint about them half-changing and blocking both lanes, it's the concept of nipping between them, knowing full-well their next move will be back in.