When processing a POST, the server just gets KEY=VALUE pairs regardless of the form.

<input type=hidden name="var" value="test">
<input type=text name="var" value="test">
<select name="var">
    <option>test</option>
</select>

Submitting any of the above would look the same to the server when it received them. Though if you submitted a value that wasn't on the select list, it might be smart enough to know that. If you know it ahead of time, encode it like any other param.

my $req = POST $URL, {var=>"value", selectvar=>"selectvalue"};
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-Lee

"To be civilized is to deny one's nature."