Please support a feature (outside of QoS) that supports simple network-wide bandwidth limits, then in a future release extend that to individual device customization. 
 

ISP data caps and parental controls are both use cases to simply apply bandwidth filters at will, and it is long overdue. The solution/top answer to related forum posts on this subject is to get rid of your deco and revert to a cheap Chinese competitor that offers more functionality. That doesn't seem like an optimal  solution for anyone, so hopefully we get this feature in a timely fashion.