Totally agree on the freedom. Actually the lock-in isn't so bad right now, as I explained on the forum https://sourceforge.net/p/obiblio/discussion/164978/thread/d9113c32/#adc6/872f

Here's a link to the layout script that the report system of 10-wip uses to produce a MARC file: https://bitbucket.org/mstetson/obiblio-10-wip/src/tip/layouts/default/marc.php?at=default
I'm not sure it would be worth the effort to try to make this work for 0.x.x, especially because of https://bitbucket.org/mstetson/obiblio/issue/1

Authorities are not implemented in any version of OpenBiblio.