So, I looked into a way to do this myself, since this is a point of irritation for not only me but my clients.
The problem with the available solutions I’ve found is tat page scroll is disabled when the mouse is over the number field. My goal was to allow the mouse scroll to change the number only when the number field has focus AND the mouse is over the number field, which is in my opinion, the way that it should work.
This combines some of what was found in the linked documents. I have only tested this on FireFox, but it appears to get the desired result. It’s also set up specifically for the WP Admin, but should work for anything.
Note: I have also added this to my acf filters and functions library https://github.com/Hube2/acf-filters-and-functions/blob/master/correct-number-field-mouse-scrollwheel-action.php since I’ll likely be implementing it on many sites.
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