There is not a vibration setting in emulation parameters or in a script. However, you could create an app that activates the vibration function, then use a script to call that application when a criterion is met.
Activate( On_Input, strScan, intScanType ) //Activate on Scan
RunApplication(YourVibratingApp.exe) //Call your application
ScanString(strScan) //Pass ScanData as Scan
I hope this helps.