So?? nothing you just said affects my suggestion/query as far I can see.
From what I gather from what I've seen in other games, having the keyboard and mouse doing the same thing isn't a problem. the only issue that seems apparent to me is that something in the keyboard control conflicts with something in the mobile control system. So the ability to turn that off is the issue, not the ability to use keyboard controls themselves. My assumption is that he didn't do dual controls before was because he simply didn't think about laptops at the time.
But all this is moot unless someone with actual experience in this engine is available to give real technical insight.