Remote forms with multiple submit controls don't report which submit was used, under Unobtrusive JavaScript

(Rails 3.0.0)

Consider a simple view:

<%= form_tag({:action => 'debug'}) do %>
  <%= submit_tag "Foo" %>
  <%= submit_tag "Bar" %>
<% end %>

When this is submitted (by normal POST), the parameters includes "commit" => "Foo" or "commit" => "Bar".

However, if the form is using unobtrusive javascript to make it an AJAX request:

<%= form_tag({:action => 'debug'}, {:remote => true}) do %>
  <%= submit_tag "Foo" %>
  <%= submit_tag "Bar" %>
<% end %>

... then the parameters do not carry the submit control which was used. This is because the function callRemote in rails.js uses serializeArray on the form; but serializeArray doesn't take account of the control used to submit the form.

I have patched my local app by making use of originalEvent, but I have no means of using Git (my corporate firewall blocks the SSH port). How can I get my patch considered?