Ah, sorry, you want to actually change the complexity requirements? I don't
think this can be easily done. The complexity variables are written into a
dll so to change them you would have to write your own dll. There is no easy
way to edit the rules, they are either enabled or disabled and have no
flexibility.
One other thing to watch out for if you enable complexity is that the error
message given to users when they get it wrong is incorrect. Fixed in SP5
apparently.