Or maybe someone knows of a method…
I often find when opening an insert plugin that it has been sitting there with its ins and/or outs overloading. This doesn’t show up in the mixer because later elements have attenuated the problem. While I never actually set them up like this (of course!), subsequent fiddling introduces the problem.
I don’t know enough about VST architecture to know how possible this is, but could an overload light be added to the mixer? One per slot would be great but one per in/out per slot would be even better. But one for the whole chain would be enough.