While at work, I leave my blackberry on my desk by my computer all day. I hate it when I am pulled away from my desk and I come back and I miss the fact that I had a message on my Blackberry but I didn't find out for a while because the LED was done blinking. I don't always remember to check my BB when I return to my desk.

Is there any software that will let me customize the length of time the LED blinks when I receive a message?

This may be built into the OS but if it is, I never found it.

Thanks!