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What do you mean? Isn't there an I gear on the SS? (Assuming an automatic here) That's what it's for. I do it all the time. You get strong engine compression and if you use the brakes on top of it, it'll give you even more compression.
Yves
In I gear, when you are using the brakes as well, something detects it and tells the transmission to help you slow down even more; try it on a steep slope, you'll see. I can make mine downshift earlier by applying the brakes.