The first few seconds (5 sec?) after the screensaver kicked in, one should be able to cancel the screensaver (move mouse, hit key) without the password lock popping up. That way, it's less irritating when the screensaver gets activated by accident when the "Fade now when mouse is here" is set. Same when it kicks in automatically after the specified amount of minutes. Think of showing a slide in a presentation for some time.

https://dev.haiku-os.org/ticket/9952