EDIT 07-06-23: Xposed module (made by agentdr8) that does the same thing can be found here.
EDIT 07-06-21: Guide is obsolete and does not work. The ROM I was using (Carbon) had native FB syncing enabled already. Xposed module is in the works.
Woops, sorry for being late. Here's the smooth scroll mod for v2.3.
Finally back home. Here is the v2.1 modified framework.jar for faster scrolling (scrolling cache disabled).
Push to /system/framework/framework.jar
v2.2 modified framework.jar for smoother scrolling. Used katinatez's zip as a template so just go ahead and flash it in recovery.
Here's the v2.0 modified framework.jar for smooth scrolling (scrolling cache disabled).