You already know: obtrusive Javascript is evil and clumsy

disable_javascript_helpers.rb

# Because obtrusive JavaScript is evil, and the Joe developer must not
# be able to introduce it with an "innocent" :method => :delete option 
# passed to a link_to.
# (C) 2010 Panmind - Released in the Public Domain
#
helper  = ActionView::Helpers::JavaScriptHelper
keep    = %w(javascript_tag javascript_cdata_section escape_javascript)
keep.map!(&:to_sym) if RUBY_VERSION.to_f >= 1.9
methods = helper.public_instance_methods - keep

helper.class_eval do
  methods.each do |meth|
    undef_method meth
    define_method(meth) do |*args|
      raise NotImplementedError, 'This method is not available in this application'
    end
  end
end