Actually it's a very basis, so you can import only product title, url and description.
In the futur I will add functionality to select the group products belongs to, so the custom fields of this group will be automatically added to the products and setting with the default values.
But it will not be very flexible because you will have to split your import file into smaller files for each product group.
It would also be great to be able to link to Brand (and why not even Stores), so pretty everything could be managed from the import feature.
I would like to have feedback about that from people (like you), using this plugin, because choices will be made in order to make life easier for youy/them, in the most frequent uses.
You can open an issue on the plugin's page on github about that, and I would really be happy to discuss about that with you and the other users, so I can take the best option for the futur of import / export feature.