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you can use HomeHelper within widgetlocker to set it up so that pressing home brings up the lock screen rather than opening the device straight to the homescreen. if you use a pin lock then home would open to the widgetlocker lockscreen which you'd need to unlock to get to the pin screen. The security definitely isn't overlooked with widgetlocker.
I have a time delay before security comes on on my phone so I don't have to deal with a pin or pattern if I'm using my phone frequently. With this set up, if the screen goes off widgetlocker lockscreen will activate so if I shove my phone in my pocket any acidental home or lock button presses will go to the widgetlocker lockscreen and won't fully unlock the device. The screen will then just time out. Is this what you're after?