I've used widgetlocker with gingerbread and the one problem that it had was the double lockscreen situation (you open the widgetlocker lockscreen and then the stock lockscreen appears) This occurred when you had the pin or pattern lock engaged. Does this problem exist with ics using the Security > Lockscreen > None proceedure you mention?
That completely disables the stock lockscreen, so you won't see it pop up at all.
