>> When was that introduced?
>
> Was there from very beginning, all DPB parameters are allowed. You
> still cannot create database in dialect 1, but that's another story.

The statement above was not correct. It was possible to connect to the
databases with dialect 1, but JayBird talked only dialect 3. I have prepared
a fix where the dialect can be dynamically changed. The fix will appear in
release 1.5.4

Roman