Notes: I am using Windows 7, and a windowed full screen SC2 window.
Step 1) Open the Control panel
Go to Hardware and Sound and then select "View devices and printers".
Step 2) What you should see on the next screen after you right click your Mouse. Select "Mouse Settings.
Step 3)Select Pointer Options tab. Select the "Show the pointer when I press the CTRL key."
Now when you hold down control it pings your screen where your mouse pointer is. If you are moving your mouse when you let go of the CTRL key it won't ping so making control groups in game shouldn't bring it up too often.
Hopefully someone found this helpful.