We are requesting a feature update by GoTo developers to be able to forward texts sent for compliance purposes.
djoertel admins or super admins have access to enable the feature on the PBX. Once this is enabled, then users can configure this on their app. There is not a way to lock this for individuals without removing the feature.
However, if you have Contact Center or Customer Engagement, you can create a sms dial plan node for users to have no control.