Settings>extras>touch
That isn't it. Only has option to vibrate when touching the nav buttons. Looks like no double tap which is surprising
Daniel said in one of his AMA's over the weekend it might be because of the QHD display that the 950/XL doesn't have Double tap to Wake, yet. Once it's worked out, it'll be added in a Touch update.
Keep on the look out, and tip the Windows Central team when it goes live!