Some supplements. Perhaps something will be useful.

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Limit the number of downloads in one post.
Immediately display the result in the composer. Without window preview.
The ability to remove notifications. Remove, not the mark. Why need the old notice? I think that they are removed immediately after reading.
Ability to delete chats and messages from chat rooms.
Make annoying people in the blacklist. Besides Only allow chat messages from users I follow.
Manage icons BBcode panel Composer. Installation and removal of BBcode.
Moving pictures in the window, like a background in groups.
Displaying the ip addresses users in the admin panel.
Guests posts in topics do not appear immediately. Guests need to refresh the page. It seems to me that this is not good.
Topic thumbnails are not working

yariplus

My thoughts:

@XenTerSeO said:

Limit the number of downloads in one post.

Not sure what this means. Like the amount of links? or total uploaded files?

Immediately display the result in the composer. Without window preview.

Not sure what this means either, mine appears immediately already.

Oh, maybe you mean editing the post in HTML mode like some forums have, that might be neat.

The ability to remove notifications. Remove, not the mark. Why need the old notice? I think that they are removed immediately after reading.

Ability to delete chats and messages from chat rooms.

I think most people like it this way because this is what most social media does, and even most email clients. A plugin could do this though by having a deleted list and filtering results.

Make annoying people in the blacklist. Besides Only allow chat messages from users I follow.

I like

Manage icons BBcode panel Composer. Installation and removal of BBcode.

That would be a plugin thing.

Moving pictures in the window, like a background in groups.

YES, I have wanted this for a while.

Displaying the ip addresses users in the admin panel.

fyi, This information is already on the profile page of each user.
It might be nice to have a User Statistics page with a table displaying this type of information.

? Offline

My thoughts about thoughts @yariplus :

Not sure what this means. Like the amount of links? or total uploaded files?

Yes, total uploaded files in post. For example, one can attach only five images in the message.

Oh, maybe you mean editing the post in HTML mode like some forums have, that might be neat.

Maybe that's what I mean. For example, can lead editor xenforo -

fyi, This information is already on the profile page of each user.
It might be nice to have a User Statistics page with a table displaying this type of information.

I delete it there. Quite a strange place to display ip addresses. I think that it would be wiser to display them in the admin control panel (ADMIN CONTROL PANEL - MANAGE - USERS).

What about - 'Guests posts in topics do not appear immediately. Guests need to refresh the page. It seems to me that this is not good'?

Guests must refresh the page topic, to see new messages.
Those who logged - new messages appear immediately. No need to refresh the page to see the new messages in the thread.
It would be better if guests also would not have to refresh the page.
Check it out.