I dont quite understand what you mean. Honestly I dont really understand what IL2CPP is all about but as far as I know it's some sort of compiler to be used in Unity5 for C#. If that's the case, then any C# script written for Unity should be supported automatically. There's no additional effort needed to support it. Fyi, InputTouches is just a bunch of C# scripts for Unity so anything that Unity support by default, it should work with it too.