Steve:
CHDIR.. gets you back to the upper level
CHDIR. gets you to the disk root
just like "CD" command in MS-DOS
About language: maybe on boot the Oric thinks a key has been pressed. Go back to the main menu, then you can select English.
About other tools: I first planned adapting several existing tools, and trying to make a kind of "total commander" (quite optimistic I think), but as we discovered bugs for several weeks/months, we needed first to get a 100% working kernel before spending time on additional tools (which then could need being fixed too).
We found more problems than expected and I think Michel (who already had provided a tremendous effort coding the whole thing), in the same idea of "not wasting time while it's not 100% sure", didn't change the docs each and every time he made a bugfix.
In the meantime I got carried away from the project by life, so I'm not sure I got up-to-date technical docs.
So 1st thing to do would be more testing to ensure there are no bugs left, then find back Michel's docs and check if they are up-to-date (maybe they are, no offense intended to Michel, it's just me that didn't follow in detail the end of the project). Then we can work on additional tools
