Scaffolding is an informal term we use over here! No offence intended!
I should admit that I do really enjoy chromatic extensions as long as they are keyed (the ones where you don't have to reach). It is difficult with the 5 strings to find a string that doesn't sound just like a rumble or a drill or something.
Paul was saying that if you get the right string, the long belcanto, the new evah pirazzi or the permanents (? not sure if it was permanents or flexocore) that the C can be really great. It's a matter of finding what suits you and your bass I guess.