Dynamic number of node inputs (Math Expression node)

When doing math with nodes, you can do one math action at a time with two numbers. So, if you are doing anything that requires more, you have to keep adding math nodes one after another, and they just keep piling up and it becomes a mess quickly. The solution to that is the ability to add/remove as many node inputs as you want.

My proposal to create either a new math node type, or replace the whole math node with a node called "Math Expression" In which, the user could write a math expression using the variables connected to the node, instead of selecting one from a list.

So, if you want a sum, you write "A+B". Simple, right?

Or, if the user wants something more complex, they can write something like "2*A+B/2". Currently, this would take three math nodes to do. It would be a lot cleaner if only one node was required.

But what if there's more variables that are needed? Instead of using multiple math expression nodes, the user would have the ability to add more variables by pressing the "+". It would add "C", then "D", and so on. Variables would be removed by clicking "X".

By default, if there is no "C" variable, the value of "C" would be 0,

(Note: Removing the "B" variable, would turn the "C" variable to "B", and the written expression would automatically update)

There are other uses for this. For example, the ability to dynamically add and remove inputs of a node would also allow a more advanced ColorRamp displayed in the image. Or How about a ShaderRamp to mix three or more Shaders together?