How to make the vibration for message alert vibrate more on Nokia N97?

So I managed to just have vibrate as an alert for the message alert but I’ve noticed that when i receive a message you can hardly notice the vibration cause it only vibrate in a short bit.

So I was wondering how can I make the vibration be longer or have more pulsation? Like the old Nokia phones when you have the message alert on vibrate it would vibrate a lot of times and longer when you receive a message, that’s what I want on my N97 so how can I do that?

P.S don’t tell me to go to http://www.n97geeks.com/Forums/ cause I did and asked this problem and NOBODY helped me out.