Passing custom fields to FormIt in FormItBuilder

I have a number of forms created in FormItBuilder and I'm using FormSave as a hook to save the results to a database. This is working well, but FormSave has a custom setting which is usually passed in via the FormIt call: &fsFormTopic=`contact`

I can't for the life of me figure out how to tell FormItBuilder to pass this setting into FormIt.

Is anyone aware of a way?

I do not use Formbuilder but I may say how I changed that fsFormTopic when I have a FormIt whith FormSave.
I made a hook which is called before FormSave.
My hooks param of formit looks like:
&hooks=`contactFormPreSaveHook,FormSave,email,redirect`

In that 'contactFormPreSaveHook' I change the fsFormTopic as I need :

$formit =& $hook->formit;

...

$formit->config['fsFormTopic'] = 'MY wanted one';

FormBuilder has also hook parameter and you may add an own hook where I assume you may do as above and thus also the fsFormTopic will be set.

Maybe it worth to try something similar.