Sig length scoring (was Re: subscribe)

Quoting Eli the Bearded (process(_at_)qz(_dot_)little-neck(_dot_)ny(_dot_)us):
> Anyone have some suggestions for scoring based on sig length? Assuming
> a RFC1036bis sig indicator (^--[ ]$) is fine.
I was intrigued when I read this; I thought about the possibility of 
stripping those long  gratutitous sigs that some people put at the 
end of their email (like I want to read it). Is there some way I could 
set an arbitrary max sig-length and replace big sigs with some string 
(like "I deleted this dope's 8 line sig!"). Am I dreaming?

Mike Stone