Disabling Pattern Unlock when Power Button Pressed
Android's lockscreen widget by design comes minimized, and you have to manually maximize it.  There is no way to configure it otherwise.

That said, some custom ROMs (e.g. CyanogenMod, AOKP) offer the functionality to enable showing the expanded lockscreen widget when the screen is turned on:



Of course, you will need to unlock your phone's bootloader and flash custom firmware in order to obtain this feature.