Hi Nathi,
“…I still have to go into the node tree and manipulate the float curves manually…”
You might want to have a look at 5.0. Blender has got a new feature called Closures, that allows you to handle that and adjust your Float Curves (or anything) from outside the Node Groups. Here’s a great video: https://www.youtube.com/watch?v=eCEiYfM3G_4
