I'm really not a fan of this new idea, especially if it extends outside of the tutorials. Factorio's theming up until now has been desolation and impersonality, no faces or anything, and this pretty much wrecks that. I guess multiplayer would be different, but I'd guess most play singleplayer. If ...

How about adding two little buttons on the logistics tab to increment the requested item count by the item's stack size? So if you want 2 stacks of advanced circuits, first make the request, then click the button to increase the amount by one stack. Can bookend the scrollbar with them.