Yes, I'll make a "slideToUnlock" widget.
I don't have much spare time during this days (and I'll be away for two weeks) so I cannot say when an update will be released.

EDIT:
@gng554: check the configuration file, the default is to look for the background at "/opt/usr/share/themes/alpha/backgrounds/lockslider.png"...maybe I set the wrong default.

Maybe "/etc/hildon/theme/backgrounds/lockslider.png" is a better default value!