Thinking again at it, that /mnt/ext1/system/bin is in PATH for user applications must have been well known since a while. Maybe that is defined in some .rc file which I haven't located. I refound that I had already a number of tested applications installed there, like utelnetd, cr3-pb.app, epubinfo.app, sh_ivtools,app etc.
As for the OS doing some translation of the names, I remark that a) the name of eink-reader.app in the pulldown menu is localized; b) eink-reader_with_pdfium.app and eink-reader_with_rmsk.app don't appear to correspond to a binary of that name, maybe they are internally aliased to eink-reader.app + parameters.
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