Throttling Problem Users

It would be very helpful to have a way to throttle users in the capacity rather than a workspace. Giving user their own workspace is not an acceptable workaround. For example, if there are 500+ users but 3 are frequent problem users, and we have advised on best practices and re-trained them yet they still spike, we need a way to protect the 500 from being impacted by the 3. Taking away their access is unfortunately not an option and they are using the same models as the bulk audience. Once they make the naughty list, throttling them at the capacity level would be extremely helpful.