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Even though the thumb and track are marked "required", you can actually create a scroll bar without them. You'll probably want a scroll bar with just the up and down (or left and right) button parts.
To scroll more of your list, you might be able to tweak properties like step size to get the effect you're looking for.
Thanks for your answer.
I tried to play a little with the scrollbar parameters but didn't manage to create the effect I wanted. It feels like my settings are being overridden due to the fact that I'm inside a datalist. Is step size supposed to be the number of "repeat items" you scroll when you hit an arrow button ?