Thanks for making this plugin! It's super useful. I'm using it to submit entries to a custom post type, and I have customized your plugin with a filter on the $postData variable *just* before it gets sent to wp_insert_post. This allows me to add in the custom post type, and generally customize the call for my purposes. I was wondering if you might consider adding a filter to a future release? It would be very useful for my purposes, and I'd image lots of other developers!