Glad to know that my appearance was expected :-) About your question. The Developer app provides the advanced versions of the main UNA service apps like the Polyglot, Forms, Pages and Navigation for the already existing modules and Settings for the whole UNA. For example, you may create a new form via the Developer->Forms app with all possible settings, but for the start to work with it you need to use the following code like:

bx_import('BxDolForm');
$oForm = BxDolForm::getObjectInstance('sample_form_objects', 'sample_form_objects_add'); // get form instance for specified form object and display
if (!$oForm)
    die('"sample_form_objects_add" form object or "sample_form_objects_add" display is not defined');
$oForm->initChecker(); // init form checker witout any data - adding new record
if ($oForm->isSubmittedAndValid())
    echo 'inserted id: ' . $oForm->insert (); // add new record to the database 
echo $oForm->getCode(); // display form 

So without own sample module described here and here you can't use this form. The sample module can be found here . But yes, the description of every page and field of the Developer app will be good anyway.