There is no way to do it,but you can add a String field and store the
UUID as a secondary key and index it.
anyway UUID as primary key is a bad design(in most cases) and is
slower to do lookups in almost all databases(if not all).
if you want you can implement your own UUID field,just look in the
source code of
http://labs.urielkatz.com/browser/JStORM/trunk/src/JStORM.Field.js