I think srv.arc is still pretty rough- I've been able to uses it with success, however, despite the quirks.
PG is not really a big fan of consistency. I think his reasoning is that consistency is another word for duplication and if you have it you're probably not using the most concise definition of your problem. I think this explains the inconsistencies in srv.arc. I suspect, as time goes on, this file will become smaller and cleaner as pg refactors it- However, I doubt it will become more "consistent".
One classic example of the lack of functions "for consistency's sake" in arc is that there is no 'cdar.
When you say you've been able to use srv.arc with success, do you mean the unmodified arc2.tar version or a patched version such as Anarki? Let me clarify that when I said above that srv.arc was broken, I was referring to the official version.
