Guys you are getting to separate issue's confused.

The question is when coming up to a set of lights how long should i leave it in D-mode for, if your going to be there a while IE its a big junction TT is advising that you put it in neutral. If you just pull up and they change to green almost straight away then staying in drive its OK. If you are stationary for any length of time and leave it in drive then what you are doing is holding it on the biting point of the clutch.
What is getting everyone confused is TT commented on driving style as well. If you pull up at a set of light's and put it in neutral then you can pump the brake, dance on the brake, do anything you want to do with the brake or indeed the hand brake it has no relevance to the question or to the gear box.

Even if you leave it in D-mode when really you should have put it in neutral all you are doing is shortening the life of the clutch, by how much who knows.
When i drive a normal car i hold it on the clutch quite often at junction's its the same thing, you shouldn't but we all do.
I think TT's point is when you pull up at a set of lights in a normal car 99% of us knock it into neutral and either put the handbrake on or hold the foot brake or sometimes do neither if on level ground. But in a DSG and i know i am guilty of this we just hold it on the brake, i think its the mindset that i don't need to touch the gear stick because its automatic as well.
