I just noticed the update on the manufacturers and was wondering if anyone had opinions or information:

1. does adding custom filenames for pre-existing manufacturer pages cause any SEO problems?

2. This isn't directly associated with the change but I noticed that bing webmaster tools wasn't happy with the fact that my category pages had no h1 tags. Do you think that this is important for SEO on category and manufacturer pages? (All of my products have h1 tags)

Thanks for your opinions!