I'm sure there is a pan roof already built. I'll have to check my sheet. (EDIT: I see Kendo's post, it is his I'm thinking of then).
On the trends, unfortunately each theory has been shot down in flames. You're right to say it seems like dealer allocation makes a big difference but this is hard to confirm. Firstly, it could be that dealers are often very ignorant of the lead time so their quotes are somewhat random. Secondly, in some cases they may be modifying an existing order, so they are able to give some people order now or recently a very good deal delivery wise, while the rest of us are stuck in the queue.
The real problem is that their darn estimates go up and down like a yo-yo. So we can confirm a few orders are in BW confirmed on the tracker, but it is virtually impossible to judge anything because all the remaining orders not confirmed could end up being built any time, so even if there is a good split on options until some start to be confirmed no conclusions can be drawn.
We've heard VW say that both the DSG and sunroof cause delays, yet some of the first orders to arrive have DSG and (I will confirm) at least one is with the sunroof. I'll check colour too, but I'm sceptical.
Frankly if they set out to produce the least helpful system they could it would be hard for them to improve on this one.