I've tried to do a custom hand animation but It seems during the last updates of the tools, Addon builder cannot be able to binarize correctly rtm.
This issue can be viewed more detailed and explained on BI forums:
http://forums.bistudio.com/showthread.php?181457-Help-with-custom-HandAnimation
Finally, I've tested an older version of Addon Builder and It works well so I've determined the problem comes on the new BI tools provided during the last 2 updates. {F24505} {F24506}