I don't yet have the 6 or 6 Plus. On my 5, it shows all the options. So not iOS 8, unless a bug. Someone with a 6 needs to weigh in. Try a hard reset, then reset all settjngs if it doesn't work. But wait for someone else to reply.
ZR_Yancy is correct. It has been that way since the day the 5s was launched. It bothered me at first because I was so used to having a one-hour passcode lock on the older phones, but then I got used to using the scanner and realized that an immediate lock makes the most sense.