There are so many times when I want to scan through VSTs and AUs quickly without the fuss of starting up a DAW.
Much easier to use a Host such as Plogue Bidule or Blue Cat's Patchwork and put the Virtual Keyboard or Virtual Keyboard synth first in the chain. There are lots of synths and sampler instruments that don't feature a piano style interface and you're pretty much stuck without an app like VK.
There is depth to the app, too. There are a number of options that add flexibility and, thus, value to the software.
In the section "Play notes too with your computer keyboard" you will see the keyboard shortcuts to increase or decrease the velocity. If this is not what you are trying to achieve, please use the feedback form that shows up when you download the demo to send us a feature request.
When an update is available you will see appear in the top left corner of the VirtualKeyboard interface an hyperlink that reads « Click here to update ». Alternatively you can add this kvr page to your favorites and you will receive a notification. You can use the same link that you received when you purchased it, to download the latest version.