As of today, Fujifilm has released firmware version 2.0, an upgrade to the internal programming of the FinePix X100 camera.  The upgrade promises to improve the manual focusing and autofocus operations of the camera, as well as improving its start-up time.  I will not be able to test the new firmware, because I no longer have an X100 camera; right now I am working on a new book about the updated model, the X100S.  But the upgrade sounds very useful and worth checking into.  Here is a link to the official release from Fujifjilm.