This is something ive been doing for quite some time now. i call it...... well i call it cool line flying around your screen that is sure to make to new grounds or eBaums world or what ever viral video/game site you submit it to.
Step 1: Set Up Your Canvas
Right under the time line you will see something that says 12 fps (default) just double click it and it will bring up a properties box. change that 12 to a 24 click ok and your ready.