We would also have the possibility to disable the creation of questions visible to everyone with questions access and the permissions have to be enforced per Space permissions.

Not sure if the idea behind Questions is more a community thing than a moderated forum having special rights for specific persons. To be honest I don't like the idea of censorship in community exchange (and yes, there might be some spam coming up).

Would be very helpful for a "Top Expert" to be provided the permissions to delete answers or comments that he feels are off-topic or spam without the need to be an Administrator of the entire Confluence site.

+1
Would be interesting as well for our large platform to be able to steer this at least on an "ask" and "ask & answer" basis.

Is there any update on adding this feature?  Our Confluence instance is growing, and it is becoming unwieldy have all users regardless of what permissions they have to be able to post questions globally.

Definitely +1 for this, but if we're talking permissioning on Questions, I'd also add this use-case:

As a Confluence Questions administrator, I would like to be able to permission viewing\editing of topics to specific groups\users, because I have both internal and external customers using Questions and I don't want the internal ones leaking to external users.

We would prefer NOT to have two instances of Confluence to support an inside\outside environment, but this means being able to hide things from our external users. We can do this in Confluence pretty easily, but not in Questions. Apologies if this issue is being strictly limited to permissioning functionality and not the questions themselves; I can open a separate issue in that case.

This is definitely an important piece that is missing for us too. As Enis suggested, 'Manage Topics' is a key set of permissions.

I can only add to the chorus here. Granular permission only make sense. We currently comparing Confluence Q&A to other products, and ability to grant granular permissions is something that's really missing.

We are also interested in more granular permissions. For example we have spaces where everyone has read access to the space but we do not want the questions and answers to show up in the global questions.

I think it would be ideal if we could configure the permissions (like view, vote, answer) individually for each space and independently from the permission to view a space.

Granular control of User permissions is highly desirable at my organization. Reputation based permissions only partly satisfies our requirements.

It would also be desirable to be able to grant access to the statistics tab to select users without having to grant global administrator permissions.

Thanks!