ibus-hangul is missing Hanja conversion. This is pretty important... Please match the expected hotkeys of popular Hangul IM software for both Korean native and US-International keyboards.
I have built the HEAD version ibus-hangul in http://github.com/choehwanjin/ibus-hangul/tree/master. I think it has implemented some features. Maybe it resolved this bug. Please try it. http://koji.fedoraproject.org/koji/taskinfo?taskID=1259230 Thanks.
Confirmed with the upstream maintainer. This feature has been implemented. Please try ibus-hangul-1.1.0.20090328-1.fc11