There's a project (created by me) which tries to work around this limitation of X by providing a daemon-like app intercepting Ctrl+Shift+U and allowing to enter UTF-32 character codes:
https://gitorious.org/ucode/ucode/ -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/531208 Title: Need way to insert arbitrary unicode characters in Kubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/531208/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp