I'd love to see BerryBuzz add the capability of controlling the speed of the blinking (BBAlerts lets you set the blink speed down to the 1/2 second, but I had to stop using it because it conflicted with the message pop-up program I was using).
The newest BerryBuzz beta, v1.1.83 allows you to set the interval between LED flashes. I'm not sure if I am permitted to devulge the link (this version is for compatibility with SmartAlerts), so all I can say is that this feature appears to be coming shortly.