A sketchy patch for ibus-anthy for just using the ordinary left and right shift keys as the left and right thumb shift keys. cf. https://github.com/fujiwarat/ibus-anthy

ibus-anthy.patch

diff --git Makefile.am Makefile.am
index 54dab96..858b6b6 100644
--- Makefile.am
+++ Makefile.am
@@ -35,6 +35,7 @@ ACLOCAL_AMFLAGS = -I m4
 EXTRA_DIST = \
 	autogen.sh \
 	ibus-anthy.spec.in \
+	ibus-anthy.spec \
 	python-config.py \
 	$(NULL)
 
@@ -50,6 +51,7 @@ dist-hook:
 	if test -d .git ; then \
 		git log --name-status --date=iso > $(distdir)/ChangeLog ; \
 	fi
+	-rm -f $(distdir)/engine/_config.py $(distdir)/setup/_config.py
 
 rpm: dist @PACKAGE_NAME@.spec
 	rpmbuild -bb \
diff --git engine/engine.py engine/engine.py
index f6ff0f4..ec98406 100644
--- engine/engine.py
+++ engine/engine.py
@@ -1689,6 +1689,20 @@ class Engine(IBus.EngineSimple):
             return False
 
     def __process_key_event_thumb(self, keyval, keycode, state):
+        if IBus.KEY_A <= keyval <= IBus.KEY_Z:
+            keyval += (IBus.KEY_a - IBus.KEY_A)
+        elif keyval == IBus.KEY_colon:
+            keyval = IBus.KEY_semicolon
+        elif keyval == IBus.KEY_less:
+            keyval = IBus.KEY_comma
+        elif keyval == IBus.KEY_greater:
+            keyval = IBus.KEY_period
+        elif keyval == IBus.KEY_question:
+            keyval = IBus.KEY_slash
+        state = state & (IBus.ModifierType.CONTROL_MASK |
+                         IBus.ModifierType.MOD1_MASK |
+                         IBus.ModifierType.RELEASE_MASK)
+
         if self.__thumb == None:
             self._reset_thumb()
 
diff --git ibus-anthy.spec.in ibus-anthy.spec.in
index faeed8f..f38ce0b 100644
--- ibus-anthy.spec.in
+++ ibus-anthy.spec.in
@@ -12,7 +12,7 @@ Summary:    The Anthy engine for IBus input platform
 License:    GPLv2+
 Group:      System Environment/Libraries
 URL:        http://code.google.com/p/ibus/
-Source0:    http://ibus.googlecode.com/files/%{name}-%{version}.tar.gz
+Source0:    %{name}-%{version}.tar.gz
 
 BuildRoot:  %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
@@ -86,6 +86,8 @@ touch --no-create %{_datadir}/icons/hicolor || :
 %{_libexecdir}/ibus-*-anthy
 %{_datadir}/ibus-anthy
 %{_datadir}/ibus/component/*
+%{_datadir}/icons/hicolor/scalable/apps/ibus-anthy.svg
+%{_datadir}/applications/ibus-setup-anthy.desktop
 
 %files devel
 %{_datadir}/gir-1.0/Anthy*.gir