Hi,
Right you can specify several packs separated by comma.
In order to delete a plugin configuration, for the moment you have to delete the line in the database.
I will create a feature request for this "delete" button in the plugin listing. Deleting a configuration could have serious impact, that's why we didn't put it...
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.