Update: I just re-read the post and realized this isn't what you would want, nevermind

Another option is to shove all of your form values into a hashref and send that to TT, like this:

my $form_fields = {
    user_name => 'username',
    user_pass => 'userpass',
    other_field => 'value',
};
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Later on, pass this into TT as a var named 'form' or something like that. Your template code would be something like:

[% FOREACH field IN form %]
  [% field.key %]: [% field.value %]
[% END %]
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