Two suggestions for the extension.
Is it possible to make the plugin add the fields in a more delicate manner than to crowd the form with each choice and Mark them as optional?
Maybe a search/select one or more fields, like tags are handled.
Also, is it possible for the vendor to just add he’s username to said platform, and have the plugin handle the rest, wrapping it in a link? I’ve had some feedback where this came up, and where the vendor diddnt bother finding the correct way to link to he’s profile