Most VSTs behave nicely, some don’t.
It would be nice to have an option that sends all keyboard input to a VST window with active focus.
For instance Massive X inside Komplete Kontrol doesn’t take all keys, which results in random actions inside cubase when for instance entering a preset name in the save dialog.
So even if it’s probably the job of a VST to handle this correctly (kind of? since most VSTs manage to capture everything it’s not cubases fault, maybe?) it would be nice to have an option that prevents to much mayhem when things go wrong.