New User group for Lurkers

[forumrunt]

I am wondering if there is a hack that will take people who have not posted in a certain time to be dropped to a new user group for lurkers? We are having troll issues and I cant ban them until they do something so instead I want to put them in lurker group that will lock them out of certain areas of the board

[nexialys]

AdminCP >> Usergroups >> Promotions

it takes time to set it properly, but it worth the effort

[forumrunt]

Cool going to check now

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Ok can you tell me what I should be doing? I am looking for something that say they have not posted in 30 days it will drop them but it woudl not matter how many posts they have.

I dont think I am explaining it well