I hope so! I think I'd hoped Maemo might leave some of the problems associated with firmware on S60 and other Nokia handsets for dust! It's never a good idea to upset a mod, but at the same time it's good to know the official stand on the matter!

Point is, NvyUs is right, you need nasty third party software.. or even worse Nokia internal software to change a product code on a regular handset..

But from the flasher help:
flasher-3.5 -h

-h, --hw-revision=ARG Specify product code and HW revision

It's an official public tool.. if using that would break the terms of the warranty, Nokia *REALLY* need to let people know less they ruin their warranty out of curiosity!