If you try to create a page with the title starting with ./, your browser will interpret the ./ as part of the path and will remove it. Similar problem is with ../ and with /./ and /../ in the middle of the title. Since that happens in the browser, before even Hatta sees the URL, the options are limited.
Examples:
Compare with:
This is now partially fixed in the development version: all generated links will have the slashes in page names %-encoded. There might be still problems with URLs typed by hand into the address bar or generated by other applications, but that's outside of my reach.