Seattle Dad, Designer, Design Commission Studio Director, Creative Mornings organizer, start-up advisor and pen addict.
Speed is about pace — the rate at which you move. Momentum is about activity — the quantity of motion.
Add the feature for real. Don’t dither. Put it on the page. Scrolling is the easiest mode of navigation.
If you want your customer to make a certain choice then introducing an option that is similar and easily comparable but inferior in value will nudge (or manipulate) people in to buying the intended option.