[jQuery] Change "this" when binding element

I am suggestion for new small feaute in jQuery.
add a new proeprty to "bind" function. a Scope property.

sometimes I am binding a function inside object. So I need a solution
to change the scope of this function.
something like:
                $().bind('click',data,scope,function)

----
For Example:

function myObj()
{
this.a='1'
document.bind('scroll',this.myScroll);
this.myScroll=function () {
                //Now I am trying to get this.a
                alert(this.a)}
                //This is make an error becuase this is an HtmlElement and not 
THIS
object
}
var a=new myObj();