Dell XSP 15 9550 questions

I came from a Dell XPS 13 which had great keyboard/mouse driver support on Windows 8.1 and was wondering if the 15 had something similar? Specifically, I am looking for:

1) Fn keys to be media keys BUT become Fn keys when Alt is held. For example, they are media keys but pressing Alt + F4 closes a program, instead of Fn + Alt + F4 currently

2) A better touchpad driver that allows 3- and 4-finger swipe gestures to be customized