filefield tokens for multiple values

I'm trying to render an email template using files attached to the node. There's a CCK field that holds the HTML for the email template, and a CCK file field that has multiple values (all the images for the template).

I'm trying to merge the attached filefield images in one at a time.

in filefield_token_values, the $object being passed in is indexed for all the files, but the function hard-codes an index of 0. I can see that this is likely complicated. How could I patch this to support multiples? Basically, I'd like to be able to specify what the index of object should be.

function filefield_token_values($type, $object = NULL) {
  if ($type == 'field') {
    $item = $object[0];

I am more than willing to write it, test it, make it work for me, and submit a patch, but could use a little pointing in the right direction.

I want to say I've seen other modules do something like [yourtoken-1] where the -1 is the specified index. I can't locate anything like that now that I need to, though.