New Post: Possible to add a global function?

Knowing that I can add global instances of host objects to the script engine like this:

engine.AddHostObject("random", new Random());
engine.Execute("Console.WriteLine(random.NextDouble())");

I wonder whether it would be possible to directly introduce global functions to the script engine so that I could directly execute this function in my script without specifying an object.

E.g. something like:

engine.AddHostFunction("add", delegate(int a, int b) { return a + b });
engine.Execute("Console.WriteLine(add(1,2))");

Does this sound reasonable? Is this possible?