To remove the jitter from scrolling text, the next needs to be set at 80% transparency (so it isn't so harsh), and moved in whole-pixel increments.
This amazing template makes it super easy. Just open the AEP, select your desired format comp, past in your roll art, and parent it to the null.
Silky smooth.
http://www.reduser.net/forum/showthread.php?58688-Silky-smooth-credit-rolls-in-After-Effects