Extending to 32K row limit

I know that I've seen this answer before but can't seem to find it for
7.0.2 in the archives. Which file(s) need to be changed to have Postgres
default to 32K size row limits rather than 8K? Has anyone run into any
horror stories after going to 32K?

Thanks.
-Tony

p.s. Could the procedure for increasing to 32K rows be added to the FAQ?
(Hopefully, it won't be necessary post-TOAST).