I've never seen computer keys used in place of piano keys before though I am sure being able to customize the feel of the switches is pretty nice. Are there production midi controllers that do the same?
I hope it means the little blurb you included. I hate video posts with no summary, comment, or excerpt. When it’s just a link, I never click it. With the added info, I can decide if it’s worth my time. The title alone is never enough to temp me to watch.
I have no idea about MIDI controllers using keyboard keys, but it seems quite popular for DAWs and similar software to support this. I've tried LMMS, Ardour and MilkyTracker so far and they all had it.
For quickly trying out a melody/chord, I also like to keep VMPK installed, which is basically just a software to play piano on your PC keyboard. I believe, it could also be hooked up like a MIDI controller to DAWs.
I will say that using a PC keyboard for this does not always work terribly well, since most PC keyboards are not built for pressing many keys at the same time. They will just not accept certain keys being pressed together.
There is PC keyboards with "n-key rollover" which don't have this problem, but you might as well get a proper MIDI piano keyboard at that point...