I'm not sure about other phones, but I know the Samsung S Series phones offer app shortcuts on the lock screen. From the lock screen, I could swipe up from either corner to quickly access any app (pretty helpful for camera).
Do you know if this capability is possible with Graphene OS... I know it's not stock but could a different launcher achieve this functionality?
Also just a side note, but it would be pretty great if I could use those lock screen shortcuts to quickly change user profile's. Or, if I could create a shortcut on my home screen to quickly change to another user profile.