I’ll hijack your request to mention two more keyboard layouts that would be useful to have: Belgian AZERTY (using the Dutch text prediction), and Persian. Both exist or existed on OpenRepos, but it’d be nice if they came with the default install, and the first one especially is sorely missing for Belgian customers (at least those who haven’t taught themselves how to type on a QWERTY keyboard).
(And if the Belgian AZERTY layout could have dual Dutch/French text prediction, that’d be sweet.)