There's no kinput2 component, so I selected imlib. Japanese IM window does not come up after installation. It seems that kinput2 is not in /usr/X11R6/bin. Do the following to reproduce the problem: Install RH7.0J in custom mode and select all packages. Run X11, and launch GNOME terminal. Enter [Shift] + {Space] to launch Japanese input method (IM). It seems that if you select some packages (not all) and do installation without the CD-ROM 2, the Japanese IM window come up. I've once asked RedHat support (Red Hat Service Request #160852), but the engineer asked to ask Bugzilla.
Resolved in 7.0.1j