Is it possible to set up multiple controllers without writing each one out in the Input Manager?

For context, I’ve read all of these:

I have no issue sitting down for a bit and just writing out each of 4 controllers, but if there were a quicker way of going about this, I would like to know.

I’ve considered tampering with ProjectSettings/InputManager.asset but it doesn’t open as cleanly as I thought it would (tried using Atom).

So, as a question: is it possible to set up multiple controllers without having to write each one in the Input Manager?

There are unity libraries that does multiple controller support easy.
This thread gives a nice answer for a similar question: How to map multiple controllers - Questions & Answers - Unity Discussions

Below i just copied the content of the answer in case that link above become broken.

                <strong>Answer</strong> by <a href="/users/426237/idbrii.html" rel="user" nodeid="426237" data-hasqtip="3" aria-describedby="qtip-3">idbrii</a>                    

Apr 07, 2015 at 07:02 AM

I think what you’re doing is the only way to setup multiple joysticks with Unity’s InputManager. You also have to tune the gravity/deadzone/etc values separately for each gamepad : (

There are both free and paid alternatives to unity's input manager that might make this easier.