gmurtaza the best thing would be to duplicate my scenes and change things from there, that way you can still get updates without losing your changes.
As for mobile touch, I can't guide you on how to do it, since I didn't do it myself yet, and I'm not supporting mobile yet. I only support the current features, on desktop and webgl.
besides the touch inputs, it's also the UI that needs to change for mobile, to provide access to all actions you can do with mouse and keyboard, so there is quite some work to do there, just so you know.