A single stereo (or multi-channel) plugin with a mono instance of the plugin on each side (like in Pro Tools and Logic) would be a very welcome feature to see in the next version of Cubase.
This works wonders for widening the stereo image by setting slightly different parameter values of the same plugin on each side.
Seen this suggested before, but somehow this useful and convenient feature gets neglected every year.
Not sure, if VST3 standard supports such an option, but it would surely save a lot of trouble/time, if it would be possible to avoid setting up this trick with mono FXs tracks.