> For #1 you can just use a closure.
It is unclear to me what you think doesn't work. A closure can easily store state. As you yourself demonstrate in your rebinding example, you can store and mutate scope if you use a mutable datastructure (like a list) to avoid rebinding problems.
Perhaps if you gave an example of what you think doesn't work, I might understand your point.
For #2, the method documented in http://stackoverflow.com/questions/972/adding-a-method-to-an... doesn't seem so bad to me.
It may be deprecated. But it still works.