No kidding. The modding potential is huge.
Modders could also fix problems RED can't/won't fix. Cough...HORSE STUTTER...cough cough.
I'll just leave this here.
http://forums.cdprojektred.com/threads/46184-The-(Un)Offical-HORSE-Stutter-Thread-Not-addressed-in-1-05-PC?p=1753664#post1753664