A hammock task can be created by copy>paste special>link. But this is clunky and I don't have faith that it is actually working. I'd like the setup to be easier. For example, you should be able to define a task as a hammock, define the resource and allocation, and define a special relationship like a start-start or finish-finish for the start and end points on the hammock task. It should be easy to recognize a task as a hammock task and see it schedule.