New Rumor2, I can not set the txt msg to vibrate, just tones or nothing. User guide page 32 (PDF page 44) does not do the job.
First go into menu> settings> sounds > vibrate type > messages > text messages and set the kind of vibrate that you prefer.
then go to menu > settings > sounds > volume > messages > text message >
and from there you can choose either 1) use ringer volume or 2) separate volume where it allows you to set level + vibrate as it does on the main ringer volume with the side keys. Simply turn the volume to vibrate only.
There is no notification action. If you look at the screen you see the msg icon. The vibrate works for other notifications.