In rawhide, GNOME menus no long include /usr/share/control-center-2.0 so gnome-im-properties.desktop should be installed in /usr/share/applications. (If you only want it in the GNOME menus, add "OnlyShowIn=GNOME;")
Ok, fixing in cvs. Though actually /usr/share/control-center-2.0/icons still seems to be included (at least pre-test3).
Should get fixed in iiimf-12.2-2.
Oops, no forgot to autoreconf...
Final fix is in iiimf-12.2-4.
Confirmed.