TRV requests can be sent to the other offices as well such as Detroit etc...
Yes, you can go in person to have these applications done and there have been cases where if you are not from a country where residents have a mandatory waiting period of 10 days then you can apply in person, in some cases I have heard of people getting the visa hours later, in others they mail it back to you after a few weeks.
Hope that helps!
Thanks so much. It's just that I'll feel a bit "safer" if I know that my passport is with the visa office already, so I don't mind a few hours of driving. Now getting it back is another thing:) Can't win them all.