I definitely think it's better as description instead of in the name...

It not being there currently is simply a bug waiting to be fixed.

I doubt "dimming text" will ever be implemented simply because for most NPC's the response is a random pick from several options, done when asked... and it's impossible to do a 'did you get it' pass on something that's not generated yet.
Changing that would be a LOT of work, especially seeing the payback.