I don't think it would be wise to put lentils in anything other than a solid tub machine, but it probably wouldn't matter which speed was used for their agitation. Maybe just less time with regular agitation. But then again, what do I know?
My bad for not realizing that this cooking tip was what prompted the OP's question, but I guess it would eliminate the need to pick through such a large quantity of lentils. I generally use lentils a pound at a time, so even using a GE mini basket seems like overkill to me.
Great discussion! Keep the comments coming!