Yeah, Kitty - taken their services [replacements, filler pages, etc] for years as well in CM. Though, it's been a while since doing business at the US Consulate in Chiang Mai, I doubt they've changed their easier policies much compared to their messier bigger brother on Wireless Road - BKK.
Certainly, there are service items that they don't do - but passport related items are always a better ride at CM.