Simplifying associations #find code using scopes

Am I missing something, or is the code for association_collection#find
incredibly redundant with the code to merge find scopes in
ActiveRecord::Base? I put in this ticket:

http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/1994-associationsfind-should-use-scopedconstruct_scopefind-except-with-custom-finder_sql

Does anyone know of a reason off hand that this wouldn't work?