Configurable thresholds for the wasted spend detectors

Writing this up properly as promised in an earlier thread. The zero-conversion keyword detector needs at least 30 clicks and at least $25 of cost. Both of those are sensible defaults and both are wrong for a vertical where a single click costs £40. By the time a keyword of ours has 30 clicks it has spent well over a thousand pounds, and the detector has been silent for the whole of that. The same logic runs the other way for someone spending 20p a click, who probably wants a higher bar than 30 clicks before anything is called dead. What I would like is the cost floor and the click floor set per account. Not per user, per account, because the right answer is a property of the vertical rather than of who is logged in. I would also accept a much simpler version: express the cost floor as a multiple of the account's average CPC rather than as a fixed number. That adapts automatically and needs no configuration at all, which is probably a better feature than the one I'm asking for. Related but separate, and I'll not muddle them: an ad that's deliberately low click-through should be mutable on the underperforming ads check. Different request, happy to write it up on its own if useful.