My Quad 99 system has a remote control, the original tuner developed a fault and the remote didn't do anything related to it. The tuner itself worked perfectly. Thus, there are two circuits inside, one does the radio part and the other does the control part. This is the expensive way to do things meaning that the control system is independent and the tuner can function without it. I will leave you to imagine the cost of producing a switching system that can be controlled remotely but which will continue to work if the remote system fails. NVA is a small company and developing such a system in -house would be a distraction, buying it in would be expensive and would, inevitably, compromise the signal path.
Paul knows that Richard would have been horrified at the suggestion and would have had strong words on the subject. Best to accept that a passive pre-amp sounds better without a remote control.