ONLY when i use my track pad/mouse on my laptop and cross the center of it a COUPLE times every thing hangs. Then when i use my external BlurTooth mouse it doesn't hang not once. I Need to know. 

how do I fix this cause its annoying?

Also HOW DO I DISABLE the ALT+leftmouse click?. 

i would like to use blender and other apps that require this alt+leftmouse click.
This would seriously be the only reason for me to go back to windows(which i dont want to do ever again)