Once I loaded the Boeffla kernel and set selinux to permissive, this app worked like a charm ! I was able to press the option (alt) key at startup and finally boot back into the Mac HD. The trackpad, mouse and buttons are very intuitive. I noticed for example that if I press the trackpad while the keyboard is up, I can continue dragging my finger across the keyboard without stopping the trackpad function. This is very handy for dragging windows out of the way since I can use the entire phone screen as the trackpad. I wish to thank the authors of this app.