Show/Hide All: allow user to set a time interval

Request:  It should be possible to select a "wake time" for Show/Hide All (SHA). 

Reason: Due to memory problems, I probably have more stickies on the screen at one time than other people. Especially when I'm doing something urgent. It would be nice to hide them with a single click until I finish what I was doing.

My current problem with SHA is that any operation on a note seems to waken SHA. So I seem to be pressing SHA every few minutes, until I finish what I was doing.

Thanks.