I’m setting up a community and we’d like to disable auto-promotion so that we can use the trust system but have more manual control over it. More specifically, we’d like to leave levels 0 and 1 working with auto-promotion, but levels 2+ would require manual promotion
I haven’t seen any option for doing this. My current plan of action is to just set unreachable limits, but wanted to see if there is a proper to do it before applying my duct tape 
Thanks!
Should be fairly simple, just make tl2/3 impossible to achieve via site settings. That is in fact the proper way of doing it.
Would it be an idea to have a toggle per trust level (enable / disable automatic promotion) instead of having the admin enter multiple unattainable values to disable automatic promotion?
Its so rare to want I am not sure its worth adding.
We also do not want people to disable this unless they have very good reason to. Part of the promise of Discourse is that the community is trusted to help moderate itself. Turning trust levels off is counter to that philosophy.
I think we may attack this problem using custom user groups instead. It seems to be the proper way to do this (we’re still wrapping our heads around the system). Is there any word on when group administration features, specifically, granting a user permission to add/remove users from a group?
That’s on the wishlist, and I think some of the technical foundation has been laid already. Needs quite a bit of UI work, I think.
Understandable. However, it depends on the use case. For forums/communities, what you said makes perfect sense. But I want to use Discourse as a blog, and this feature request would be valuable, I don’t want to have blog visitors promote themselves to more rights all of a sudden.
So, a vote from me as well for this feature. Until then, I will do the same workaround but it would be nice to have it.
(Sorry for ressing an old topic, I needed to ask the same question so I found this).
Thing is, it is doable today, just make the promotion impossible to attain and … problem solved 
tl0 からの昇格を不可能にする方法はありますか？匿名ユーザーが特定のカテゴリを読み込めるようにし、特定のログイン済みグループメンバー（「コントリビューター」）が投稿や返信などをできるようにしたいと考えています。これはすでに機能しています。
次に、アカウントを持たない匿名読者にサインアップのオプションを提供したいのですが、手動で昇格させるまで tl0 に制限したいと考えています。そうすれば、通知などの機能は利用できますが、投稿や返信などはできません。
招待されたユーザーのデフォルト tl を tl1 に設定していますが、tl0 が自動的に tl1 に昇格しないようにする方法がわかりません。「tl1 にはトピックの投稿が必要」「tl1 には投稿の読み込みが必要」「tl1 には滞在時間が必要」といった条件を非常に大きな数値に設定することも考えられますが、少し不格好に思えます。見落としているより良い方法はないでしょうか？
いいえ、それが正解です！
ありがとうございます！実は、新しいユーザーが自動的にどのグループに参加するかを制御できる限り、Understanding groups and category permissions が必要だったようです。