Help with vibrate bursts

When I set the phone to vibrate only, does anyone know how to make it burst more than once for anything? I go to profiles and I can change the vibrate to custom and change the number of bursts but I think it only changes it when the phone is in its normal sound mode...Like it will vibrate twice then ring...I want it to be on vibrate and vibrate twice

anyone? If my quetion isn't clear let me know, I read it and I didn't fully understand what i Wrote

I think U have to create a custom profile, burst short or medium then, pick the number of times you want it to vibrate.