grog,
Some of this is due to the nature of the source code. Address lookup starts at usdir.rdm (the index). Without an index- pffft! For this to be fixed, the search algorithm must be modified.

But searching the path for subdirectories, I can do. (I'll also ask upstream about it also.) I'm actually surprised that also happens with the x86 version. (I changed the paths searched for maps. I would have guessed that I caused it... )

cheers,
kernelpanic