Hi Friend,
Below are the advanced options that DRS have that can be configured from the screen shot that you have given above::
Refer : DRS performance Tuning section from below PDF to get all the details on all DRS advanced settings.
http://www.vmware.com/pdf/Perf_Best_Practices_vSphere5.1.pdf
Note: You need to specify advanced option and its value. However, it is not recommended to change DRS default settings until it is really required. Also we should be very clear on the impact that custom setting can have on DRS. DRS does not migrate the VMs the way that you want based on CPU % 30-40.etc. Read : DRS Deepdive - Yellow Bricks.
Yes, Alarm itself can not take any action for you. It just alarm you to take action.
Can you please me to the resource where you got :when the CPU reaches aperfomance of 30%. etc..
For configuring DRS : Refer:
Let me know if you need any other details.