Well, I agree. But when the module is flawed you do what you can. I suspect when image doctor arrives the sharpen module becomes redundant, in which case output slider won’t be necessary. Not sure if that’s next version or not. But if question is does anyone currently use it, answer is yes, and if it does things input slider cant do, answer is yes.
Also, if this is adding a new item to gui, instead of replacing old ones, then perhaps you don’t need to add a new output slider, as the old output slider will still work for the few that use it.