wp mirror, 23/02/2014 15:26:

c) Third best, would be to patch `mwxml2sql'. This I also favor, but would like some guidance from its author, Ariel Glenn, before I start hacking.

This seems the most likely. Probably, mwxml2sql has to be fixed so that it does whatever importDump.php/Special:Import do. Only if they both have the same problem with full page names in <title>, then the export should be changed. This is my guess only; at any rate do file a bug if there is a difference in behaviour.

Nemo