I think the timeout for the lock screen is way too short a time and needs to longer than the 5 mins. MS should have stuck with the original lock screen timeout on the older Nokia Lumias. Hopefully they (MS) will include this in the next upgrade.
I hope ms would implement 2 features about screen timeout:
1, detect user's eyes using front sensor. when the phone knows the user is looking at the screen, the screen will never go off (some other systems / phones had this feature).
2, allow user to shut off the screen while in continuum mode (it's impossible now. if you shut off the screen, the continuum session will end).