As a dynopack operator I thought I would throw out a little information about it.
You all know it can do a sweep, this is used for power pulls. The reason everybody uses this is because this is what people are used to seeing. You are able to vary the time to whatever you wish.
You can also do a stepped pull where at every 1k RPMs it will hold the motor for a given time.
It also will hold the motor at whatever RPM and at whatever load you wish, this is what you would normally use to tune EM one cell at a time. Very similar to a Dyno Dymanics unit (which I very much like, although I love my hearing)
I don't know if this has been discussed since I have just skimmed over the post.