Extend max length of rule 'set node title'

Hey,

I am trying to configure a rule set to set the node's title with rules, for updated and new content. The ideal title can be set with the use of a token and some custom php code. The idea is the title would look something like this:

[node: (cck_field)] code. The problem is, my code is too long for the field title box. The reason my code is long is I need to extract the taxonomy values from two arrays from freetagging, so the title can appear as [cck title]-tag-tag1-tag2-tag3-tag4-tag5 and so on. I have written the code to extract the items from the $node->tags array and sub-arrays, but it's too long to put in the title box.

My code is here:

<?php 
foreach ($node->tags as $key => $value) {
foreach ($node->tags[$key] as $k => $v) {
print $node->tags[$key][$k]->name.'-';
}
}
?>

I can't fit all of that code into the title box, and I can't shorten it to the best of my ability (which isn't saying much, considering I'm very much a beginner in php). I tried making a custom module and tossing that code in a function, but the problem with that is, I don't have access to the $node object, so calling the custom-defined function does nothing. So, in short, how can I allow that textfield to accept more characters while generating the title? Is it set within rules module, or is it set in post settings title or some other drupal setting? If it's done within rules, which .module or .inc file creates the $form array which sets the #maxlength property so I can expand it (I don't mind hacking the module, god knows I do it all the time).

Any suggestions?

Thanks in advance!