Best practise for overriding rails helpers

hey all. I just overrode rails' 'options_for_select' helper to take a
third argument in each subarray which is used as the title (ie tooltip)
for each option tag. I'm wondering in cases like this if best practise
is to just leave it in application_helper (where it is now) or if it's
better to draw attention to it by putting it in lib and properly
overriding the existing options_for_select, wrapping it in the full
module structure, ie

module ActionView
  module Helpers
    module FormOptionsHelper
      #custom method here

what would y'all do?
thanks, max