Create a new moderator user group with editor user role and default standard access. Name this new moderator group appropriately, eg Moderator-Forum1 to better remember the intended role.

Edit the user profile of the member you wish to have this role to be in the Moderator-Forum1 user group.

Next go to the Forums dashboard and edit the permissions for Forum 1, change the permission for the Moderator-Forum1 user group to "Moderator".

Awesome, thanks for the workaround.

I'd love to see this become a feature.