I made BizznessTime theme the default theme (in r771074 and of course trunk only). But I have just found an annoying, but not blocking issue : in you are logged of you can't login to webtools directly.The "For something interesting make sure you are logged in, try username: admin, password: ofbiz." page show up but there are no means to login.
For the moment, tt's easy to go back and use another component to log. I have put a comment in https://issues.apache.org/jira/browse/OFBIZ-2312
Jacques