Currently the included mediatype templates use hardcoded credentials in the parameters e.g. <PLACE USERNAME HERE> and <PLACE PASSWORD HERE> preventing to easily upgrade the template whenever a new version is available since it will overwrite the parameters again.

Wouldn't it be a better idea to make it refer to macro's (e.g. {$MEDIA.SLACK.TOKEN} and have the user configure that macro instead? This would allow people to easily upgrade Media Types without needing to manually modifying the template before/after importing.