Sometimes I want to craft 6 items instead of five, or 3 instead of one. Whilst I can left click to manually reach that amount, I do enjoy all the 'types' of pre-requisite resources being grouped together.
It would be super useful if in the crafting menu, we could hover over an item to craft and hold CTRL + Scroll on the mouse wheel to choose the amount to be crafted.
If this idea was to be implemented, I think a little preview box should appear to the top right of the cursor to give an indication of the amount to be crafted. My skills in paint not so good, here is my example:
![Image](https://forums.factorio.com/images/ext/ccf8bcc6168efded08668b3d8597a4ad.jpg)
Additionally I think there should be a cancel option, say using Q to cancel the scroll craft, just in case it was done accidentally, especially for the achievement crafter's.
Edit - Just thought of another addition to this, CTRL + Scroll wheel on chest to insert full stacks at once. Making it great to insert and possibly withdraw stacks, could be forward on the scroll wheel to insert and back to withdraw?