Selecting from different lists as subscriber?

Is it possible for the subscriber to select lists seperately?

Though lists from mailster are supported within the plugin under the “mailsterCF7” tab, one can just check lists internally. A subscriber cannot choose from these lists, since the lists are not given as mapped fields in the plugin. So no lists show off in the frontend and even if one creates a checkbox tag, the values (e. g. list 1, list 2) are not handed over to mailsters subscribers. As admin it is possible to individually set lists from the given ones in the “mailsterCF7” tab, but they are then set for all subscribers equally.

If this is no bug the plugin will be pretty useless for users with more than one selectable mail list. But maybe I just didn’t get it. Any idea on how to make lists selectable by the user?