I respectfully disagree with the idea that everything one has done has to be slanted toward helping humanity, or that it all has to be medical/medically related. Your having done some development, coming up with a good idea, seeing it through, etc. all show something about your character (inquisitive, determined, detail oriented, etc.). Remember, adcoms are normal people and also have VERY sensitive BS detectors. Morphing an experience into something it was not is both easy to recognize and poorly received.
That said, any experience that adds depth to your application SHOULD be mentioned - even highlighted. Be confident enough in yourself to just tell it like it is. That is almost always appreciated. Having done something "doctorly" is less important to the adcom than their knowing that you have what it takes to make it through an MD/PhD.
just my tuppence,
P