Thank you for reaching us through community!
Unfortunately, it looks like Special Access is only available in Quizzes and Assignments, but not in Discussions.
We appreciate your feedback and have identified this as a feature request.
We have found few PIE ideas raised for similar query
As you deem appropriate, kindly leave your comments and promote this idea.
The Product Idea Exchange is designed for direct submission by our clients and end users to our Product Development organization and has the following advantages:
• allows you to receive direct updates on each request you submit
• allows other community members to vote on ideas
• allows other community members to contribute to and collaborate on each idea
• ensures ideas that have the greatest impact on our clients and end users receive consideration for inclusion in future releases.
We look forward to hearing from you at the Product Idea Exchange!