Announcement: lockscreendisabler on extras-devel. It is small program running background (=demon) without any visibility. It is listening D-Bus when powerbutton is pressed, then it asks screen to unlock itself (again with dbus). Because dbus is slow, you can easily see your lockscreen before it is gone. Seems to work with qtlockscreen and enhanced-lockscreen as well (but I don't know who wants tune lockscreen and then disable it). Known issues: If power button is pressed very soon after screen is locked -> screen is unlocked AND power button menu is opened.