We'd like to have folders with the Role Tree in Dashboard, or, use the Domain tree and make the Other and Reporting Objects folders not visible. How can we do this?

Folders are not available in Role Tree in the current Dashboard releases.

However, you can change the user type so that the user only sees some of the folders in the Domain Tree:

If the user type is User, the Domain Tree will only show Standard Reports and Shared Reports. Reporting Objects and My Reports will not be shown.

If the user type is HTML User, the Domain Tree will only show Standard Reports. Reporting Objects, My Reports and Shared Reports will not be shown.

Hope this helps!
Emma