A distinction should be made, is it not ?

only trusted contributors should be allowed to post stories.

and subscribers should be allowed only to read and post comments, is it not ??

If there is a way to do this already, please tell me so. All i could see in preferences was to turn on an option in which every subscriber automatically becomes a contributor.

Thanks and regards.

it's exactly like you described: if you switch off the "allow contributions"-checkbox then only contributors can post stories, otherwise every antville.org-user. so where's the problem?