I've yet to figure out how to extend the message notification time.
I constantly walk away from the Storm, and don't like having to wake the screen to check for messages when I step back into the office.
I haven't been able to find a setting that extends the notification, it goes off once and the red light flashes for what seem a few minutes then even that stops so, unless I wake the screen I don't know if there's a message or not.
My Wizard will chime every set interval and the light will always flash yellow instead of green if there's an email, obvious at a glance with no interaction.... I want my Storm to do that.
To set up alerts farther than what the system software allows you to do, you'll have to use a program such as BBAlerts. Information about the program can be found in the Aftermarket Software section here on the forum.