Walter: extend existing classes with new methods?

[Marcio]

Bill Baxter wrote:
[...]
>> There is nothing dynamic about that.
> 
> I see. Is that little bit of syntactic sugar all the original poster was 
> asking for?  And was that also all Tim Sweeny was asking for in the 
> referenced presentation?   That means you can only add non-virtual 
> methods, right?
> 


   The syntax could be C# 3.0's syntax or another. I care more about the 
feature itself.

   I want to be able to add virtual, instance methods, of course.

marcio