Well, not the way I would do it, but you could use a delimiter for your value(s)
<input type="radio" value="Value1|Value2" name="two_values" />
Then, in PHP, just list($value1,$value2) = explode('|', $_POST['two_values']);
EDIT
As @user387302 said, you would obviously be limited to not having any values containing your delimiter, for example value="One|PipedVariable|andAnother"
would not work to extract two values of "One|PipedValue" and "andAnother"
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