Keep SMS received notification window on screen longer?

[landale]

Does anyone know if there is a registry hack to change how long the email and sms notification windows stay on the screen? By default they stay on for about 5 seconds and then minimize. I would like to keep them on the screen for at least 20-30 seconds. There must be some way to adjust this. I know I can show the window again by just pressing the notification key but keeping the window on the screen longer would be ideal. Appreciate any ideas. Thanks.