My previous Berry had an option ot vibrate a couple times then ring for phone calls. Very nice for meetings etc.
Can't find it on the Torch ( or Torrtcher as I like to call it )
it still does that by default when you have it set to vibrate and ring. At least mine does it that way. However there in an added option in profiles to "vibrate with ring tone". Make sure that is off.
Posted from my CrackBerry at wapforums.crackberry.com
Path specifically is options>Sounds and ringtones>Phone ring tone.
Set "Vibration" to custom. Set "length" to what you want. Set count to 2. Set "Vibrate" to always. Set "Vibrate with ring tone" to off like joedf said.