I emailed KIS support about the 64bit (vista 64) sandbox question and it looks like it may support IE Sandboxing after all. A sandboxed browser is really the only thing 90% of us really care about anyway. Check out their response below:
Functionality of certain applications launched on computers running Microsoft Windows Vista x64 is limited when operating in the safe mode. If such applications are started, the corresponding message will be displayed on the screen if you have configured the notifications about the Application functionality is limited in safe mode event.