To give an idea of how much work this could be.
VC is designed from the ground up to pick random videos from one of three categories, based on the doX settings of the girl, and fill with a video if doX says she can but there's no video available.
But, the way it picks is to choose a random file within the directory if it does exist (and then save the last used to avoid repetition.) I'd have to tear down that implimentation and rewrite something completely different if I wanted to, say, incorporate the files in a completely different directory (say, gloryhole oral).
This is actually a very difficult task, requiring many hours of coding AND many hours of testing and retesting and bugswatting, and the gain minimal. With enough time and effort, it's doable, but it's not feasible, because this is time I'm not spending thinking of, working on, or creating better features, balancing the game mechanics, fixing other issues which need fixing, never mind doing anything in my life that isn't VCHH.
I don't know everglow's implementation, of course, though I can guess. But it might be that his implementation does not make it simple to just swap folders easily.
So I can say, yes it 'can be done' but as I like to say: 'the juice is not always worth the squeeze.'