[wp-hackers] Comment Form Hook

[Mark Jaquith]

I really think the comment form should have a function in it that 
outputs stuff that has been added by plugins.  Many anti-spam methods 
require adding hidden values to the comment form, like a 
unique-to-each-post hash, to act as a type of secure referrer... if 
there were a comment_form hook, these values could be added 
automatically without having to edit the comment form.  Automatic is good!