No stopping isn't such a problem when working above level ground, the problem is, when working in the Alps (close to rock walls), where often you don't have any way to go, but up. Gaining a few knots is standard procedure only when there is room to manouver.
When a spin has developed, winching up only makes things worse, plus the skids are not such a soft spot to hit. Been there done that - never again. So that is out of the question.
I was thinking about mounting a stabilizer on one end of the rescue bag and work from there.