turning nofollow off

i’m somewhat frustrated. for various reasons, nofollow will not stop comment spam, and it will ultimately play against the search engines who enable it. yet, WordPress 1.5 has it enabled by default, and offers no option to remove it.

i’m using pingbacks to track related posts on my own blog. it is thus semantically incorrect to enable nofollow by default. is there a documented way or a plugin to turn it off yet?