That doesn't make them vibrate.You couldn't tie your notification volume to your ringer volume to make this work? Settings>Sounds and display>Ringer volume.
Grouchy, that is good but IT DOESN'T ALLOW YOU TO MAKE NOTIFICATIONS VIBRATE. there is notification volume, but no 'Vibrate' option listed under that like there needs to be. Why has nobody made an app for this?
If you make Ringer Mode Vibrate, then notifications will also vibrate. Forgot to mention this before, been using this app for a long time now and I haven't messed with the settings since I got it.