That must have been a wild time, between brand new interfaces and a changing hardware landscape. Did you have many BSOD calls, or was that what you meant with HW driver related?
Plenty of BSOD calls for sure. Also some very memorable calls from a bunch of Linux guys who would think-up of a monster Windows machine loaded with all sorts of crazy hardware peripherals and call support to mess with us.
Are you sure it was truly just to mess with you? If I were a Linux kernel maintainer back then, and there was some hardware I wanted to fix support for but didn't personally have the money to buy, I think "trick Microsoft into divulging how their own driver for it works" would be what I'd see as a "clever hack"!