We have enough capacity, we decided that we might be able to offer Uncapped users a better overall internet experience, especially on priority realtime services, if we shaped more actively during peak periods. We're assessing the data we're getting back to see what changes we'd like to make going forward (if we do make changes).
Two broad categories of products - home and power users. For each, to defuse any complexity, devise two scripts (similar to Clientzone) to enable clients to "roll their own". Consumption and priority would be amongst the ingredients. Clients "roll their own" by specifying their requirements (expectations?). Power users would have more choices.