They do. Ive seen them use it themselves in their mod videos. I have 37 mods currently and many of their creators tell you that they can be configured in minecraft forge, yet, none for me. Not a single mod can be configured in forge like they should be able to.
Here is a perfect example, They just updated their mod today and posted a video showing them using the forge config button: https://www.curseforge.com/minecraft/mc-mods/v-tweaks