In the latest version of Railcraft for 1.10, no mcmod.info is being detected. Was wondering if this could be resolved. Screenshot attached below.

Yeah, no idea why it didn't make it into the jar, I'll need to check the build.gradle

most likely it made it into the jar but forge doesn't recognize it: it still has the modid with capital R while railraft has a lowercase modid

But there seems to be one: https://github.com/CovertJaguar/Railcraft/blob/mc-1.10.2/src/main/resources/mcmod.info

Yep, that was it!

Also...can anyone point me at some documentation for this config button?

can't find the documentation online (if there ever was any) but you can take a look at other mods that use it like JEI, you'll need to declare a factory in your mod annotation iirc from when i did it my mods.

there is an example on the new configs though: https://github.com/MinecraftForge/MinecraftForge/blob/1.10.x/src/test/java/net/minecraftforge/debug/ConfigTest.java

I think I have it figured out.