Yep! I was overthinking it :) gameObject.AddComponent ("OtherLibrary"); worked perfectly. Thanks for your ideas!

Well....

I've never done anything like that, but since you asked, I tried this:

class SuperFunkyClass
{
    var funkyVar : String;

    static function getFunky () : void
    {
       Debug.Log("Let's get funky");
    }
}

function Start ()
{
    if ( SuperFunkyClass  &&  SuperFunkyClass.getFunky ) {
       SuperFunkyClass.getFunky();   
    }

    if ( SuperFunkyClass  &&  SuperFunkyClass.getNifty ) {
       SuperFunkyClass.getNifty();   
    }

    else {
       Debug.LogWarning("SuperFunkyClass can't get Nifty...");
    }
}

It seems to do what I believe you describe.