I second the ability to change the window size.
When I first loaded Superior Drummer in Toontrack Solo, I was surprised at how small the interface was on a 46" 1080p display. I was especially dismayed once I realized I couldn't maximize it. Considering that 4k resolution for monitors and mobile devices is becoming the norm, I would think that it would be nigh unusable.
Searching around, it appears as though some VST hosts and DAW software offer the ability to disable DPI awareness. What this means is that the operating system scales the application versus allowing said application to do any scaling. The drawback is the ugliness that comes about from stretching a low res interface to match up with the current resolution. I tried out Cantabile Lite(which is free apparently) with the DPI awareness option disabled and was pleased to see that the SD window occupied most of the screen and is now much easier to navigate.