I used to hear a lot about difficulty moving on resource’s remaining work on a task, to another resource, but MSP 2010’s “Team Planner View” provides a wonderful built-in method for handling that.
The Hammock Task isn’t a built in feature in MSP. It can be done using links to schedule task dates, but it isn’t built in.
MSP doesn’t copy custom fields such as Text/Number/etc… fields to it’s baseline. It can be done with additional custom fields though.