Is GShade allowed?

[Caitlyn]

I have no idea how GShade actually works, but as long as it doesn't actually inject code into the game it should probably be fine.

It doesnt. It just changes some shaders from the DirectX interface.
People even post screenshots with Gshade here. So, its not forbidden.

But SE dont want to whitelist certain programs, because they want to keep their rights to ban everyone for any reason.