Currently "InputModeX" commands ("InputModeSwitchKanaType", 
"InputModeHiragana", etc...) have been enabled only on Windows as follows.
http://code.google.com/p/mozc/source/browse/trunk/src/session/internal/keymap.cc
?r=93#581
http://code.google.com/p/mozc/source/browse/trunk/src/session/internal/keymap.cc
?r=93#691
http://code.google.com/p/mozc/source/browse/trunk/src/session/internal/keymap.cc
?r=93#780

Although we have intentionally disabled these features on Mac OS X due to some 
UX reason, current ibus-mozc seems to be ready to support these commands.

FYI, this issue was originally reported in Issue 114 and 
https://bugzilla.redhat.com/show_bug.cgi?id=771799.
I made this thread because this limitation on Linux has been implemented in the 
converter engine itself and not related to the language-bar nor ibus-mozc.

What steps will reproduce the problem?
1. Build Mozc on Linux.
2. Create a custom keymap with any combination of following commands and input 
states.
- On Precomposition (入力文字なし)
-- "InputModeSwitchKanaType" (次のかな文字種に入力切替)
- On Precomposition (入力文字なし) or Composition (変換前入力中) or 
Conversion (変換中)
-- "InputModeHiragana" (ひらがなに入力切替)
-- "InputModeFullKatakana" (全角カタカナに入力切替)
-- "InputModeHalfKatakana" (半角カタカナに入力切替)
-- "InputModeFullAlphanumeric" (全角英数に入力切替)
-- "InputModeHalfAlphanumeric" (半角英数に入力切替)
3. Type the shortcut key on such input state.

What is the expected output? What do you see instead?
Functional.

Please use labels and text to provide additional information.
Nothing happens.