actually, last time I checked, Bonnie Bergin was teaching snuggle (hug), kiss, and lap as service dog trained tasks. her reasoning is that lap is a position that puts the dog where a person with limited upper body mobility can attach the leash or put on the collar or jacket. she also teaches feet-where the dog puts it's feet on the persons feet on the wheelchair feet thingies, and chin-where the dog puts it's head on the person's lap. this one is used as a delivery position for the retrieve, especially if the person's hands don't work too good, and they have to use their arm to hold onto whatever the dog just delivered. she believes that people using wheelchairs don't really get adequately hugged, and that by teaching the dog snuggle (hug) the person, being a primate gets that full frontal contact. but when she produces a dog, for any type of disability, from mobility, to brain disorder, she teaches each of them ninety trained tasks before she starts to specialize for the individual person.
so maybe some of the psd people have gotten ahold of Bergins list of tasks, and think they can pick and choose, rather than seeing it as part of a total program as she presents it.