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I often hit shift+space by accident (while typing in English) and brings the application to a halt.
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In my .xinitrc...
------------------ export LANG="ja_JP.UTF-8" export XMODIFIERS="@im=kinput2" xmodmap -e 'keycode 115 = Kanji'
kinput2 -xim -kinput -canna & ----------------------------
The xmodmap command will map the kanji key to the Windows key, then you have to dump the shift-space combo
edit this file... /usr/X11R6/lib/X11/app-defaults/Kinput2
and comment out the following lines with bangs... ------------------------- *ConversionStartKeys: \ Shift<Key>space \n\ Ctrl<Key>Kanji --------------------------
That would solve your shift-space problem.