You can assign different level of authority to the moderator so there is nothing to worry about. The moderator can either 'Change settings' or 'Edit posts', so you got options there.
Lets see how we can add moderators to Disqus commenting system in few steps.
Sign in to your Disqus profile and choose your blog. Now go to Settings >> Moderation >> Add Moderator. Enter the email address of the moderator and there you go. Finally click 'Save changes'