Shadow you can do clean pulls from the hang (or from blocks/pins). This is especially good for guys who are plenty strong enough from the floor, but need to work on reaching full extension. I do a lot of clean pulls and jump shrugs because my weakness with cleans/snatches is I have a tendency not to finish the pull.
I agree with Madcow, there is no reason to pull the bar with the arms for more height, because it has no real benefit in terms of explosion, since the explosive pull is done, plus it tends to ingrain bad habbits when you clean and snatch, as you're pulling yourself under the weight to rack it, and not pulling the weight up to you.
When I do clean/snatch pulls, I relax my elbows at full extension and the momentum carries the bar to about the belly button, never any higher than that.