Sure.
First, just enable an Unlock Pattern (has nothing to do with WidgetLocker). So while your phone is unlocked, go to Menu > Settings > Security > Set Unlock Pattern
Now go to the Tool Mode of WidgetLocker (you can just open it from the app drawer).
Go to Menu > Settings and check the box beside Widget Locker Enabled (obviously).
Go to Menu > Settings > Buttons & Inputs and check the box beside a button that you want to trigger the Unlock Pattern screen. For example, you might enable Back Button Unlock (the first thing on the list on that page).
Go to Menu > Settings > Look & Feel > Slider & Layout > No Slider.
Is that what you want?
[edit: deleted extra word]