ActionScript 3.0 :: Use A Parameter As A Dynamic Method Call?

I'm using the manmachine updated RPC classes to make a web service call. Currently it only allows you to call a web service method by a given specific name - ie

var token1:AsyncToken = service.myRemoteMethodName();

I've two questions about this:

a) firstly the function this call is in is written as such:

Code:

public function callService():void { }

I want to be able to pass in a method name string as a param which is then used as a dynamic method to look at on the remote server. ie

Code:

public function callService(method:String):void {
}

how do I assign this param to the service. call?

var token1:AsyncToken = service. (param goes here somehow)

b) second question is I'm assuming if I can pass one param, I can pass another if the web service at the other end is set up to receive one? eg

Code:

public function callService(myMethod:String, data:XML) {
var token1:AsyncToken = service.myMethod(data);
}