I would like to see a insert slot expander plugin come Steinberg Cubase.
Instead of 16 inserts as people are requesting - allow each insert to be expanded to as many plugins as you want - A sort of sideways rack that can be scrolled.
It would be great if the insert slot-expander plugin would also have A/B. So you could compare two different plugin chains and see which one is working best. Another useful feature, would be an easy to grab input/output fader and maybe some useful metering as well for the purpose of gain staging then entire chain.