Well, it wouldn't necessarily have to be studied...think of it this way....as a skin graft functions the skin is taken and placed over an existing spot, new cells grow from this, as they have to because the skin they have extracted is dead....so as to actually fix the problem new cells would have to be created....as in bodybuilding or exercise in general, for your muscles to grow you have to cause enough trauma to elicit a gorwth repsonse, so after this is achieved your body must "heal" the damage, which means creation of new cells....even at it's most base level new cells have got to be created for us to continue to live...at least within this example otherwise your immune system would be so run down from the "trauma" that you would certainly be very sick or die...so yes, the cells on some level must replicate....if any part of your body is faced with any kind of trauma new cells are created to become stronger....so by keeping the penis in a weakend state one could perceive that they would make faster gains as the tissue is never "healed"....
if this is convuluted I apologize...it's late and I had a long day at work....if this needs to be cleared up I"ll check back....good luck reading this...good night