Make it easier to change font size with horizontal drag

You know how you can change some of the values in the tool menus by positioning your mouse just so, so it turns into a double-sided arrow, and then dragging left or right? I want to do this alllllll the time with font size, but it’s so hard to position my mouse right on the tiny spot that lets me do it that I usually have to click into the box and use my up/down arrows instead. Would be great if the trigger area for making a quick change were just a few pixels bigger!!! Thank you!