Back to the topic, who agrees passives should be able to zero volume and have more than one input.These are trivial features and not important to me. What is important is that the passive preamp is well designed and gets out of the way. If in doing so it can zero volume and have more that one input fine, if not that is fine too.
As I stated previously I have had many passive preamps in my system. Some zero volume and have multiple inputs, some were made by manufacturers and some I DIYed. In the end the Lightspeed Attenuator which doesn't zero volume and has only one input is the one that I keep coming back to. One of the best bargains in audio and one of the best purchases I have ever made.