Thereīs a catch with the speed reduction. Even if your timing is perfect, your speed is reduced at the time of the impact of the elevator. You still have to drop to the floor. That drop gives you an opportunity to regain the lost speed (minus a neglectible amount for air resistance). Assuming a good position for the impact might be a good idea though.
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If it isnīt broken, it doesnīt have enough features yet.