qimhangul is a qt-based imhangul. refer . https://code.google.com/p/qimhangul/ which makes to enable input onto qt-based ui. imhangul cannot make to enable Hangul input feature from Qt-based environment, so we may need to consider to add this package, seriously.
I've added app-i18n/qimhangul. Would you test the package please?
sorry to late reply. we've tested in a long time and we didn't yet find any problem. qimhangul looks like stable.