Hot potatoes has a functionality which includes a javasript keyboard for non-roman characters. I am sorry for asking first and testing later (our language teachers consider it a requirement, and I haven't been able to check it for myself), but was this functionality included?
A second question, is there a developer somewhere who could add this to be used throughout moodle?
Yes, the non-roman keyboard functionality is included in the HotPot module. It appears whether you run the quiz from the XML file or the HTML file. It was tested to work with accented European characters, and multibyte Asian characters.
It is an interesting idea to add a similar keyboard to the whole of Moodle. Perhaps we better ask the maintainers of the core Moodle system to comment. Is anybody there?