Useful function, have it coded on mine. But you literally have to tell passengers every time they get out of the car to pull the door handle twice or they'll just keep pulling !!! Either that or manually unlock the doors when your letting someone out.
Here are some user guides that explain how to use NCS Expert. Some of the guides are just different ways of describing the same thing, by reading the different guides you migth gain a better understanding than simply reading just one guide. I take no responsibility for you damaging your car as a result of following these guides, that's completely up to you!
It's the only one I haven't put the effort in with Mark!
I never got around to updating to v57 myself, I also have Progman v32 up and running so I don't even need v44 anymore. But I'd like to make the move to NCS eventually, definitely seems like the most capable.