Use a form instead of content type in maestro drupal module
for those who are  still searching the answer for this question

We can use webform instead of content type with maestro, for that we need maestro_webform_task module, the module will integrates 
both web form and maestro and provides the list of already created web forms in web form task-&gt;edit-&gt;select web form to use 

maestro_webform_task