It would be really nice if there was something in the browser header to indicate whether 1) The user had a touch interface and 2) The user had a persistent on-s

It would be really nice if there was something in the browser header to indicate whether 1) The user had a touch interface and 2) The user had a persistent on-screen cursor (both may be true) but, leaking that information also opens the door for more accurate browser fingerprinting so I guess, once again, we can't have nice things because of advertising.