I haven't really used NMS FormMail myself, but looking at the source, it seems that you should be able to achieve something like what you want by setting the following extra configuration options:
$more_config{include_config_email} = 1;
$more_config{include_config_realname} = 1;
This should cause FormMail.pl to treat the email
and realname
fields as normal form fields, in addition to their special meaning.