IME 関連のバグ報告一覧
コメントを残すか、Vote をすることで、日本人利用者が困ってるということが伝わり修正されやすくなると思われる。

unable to finalize kana-kanji conversion ... / General forum / Sublime Text
http://sublimetext.userecho.com/topic/52165-unable-to-finalize-kana-kanji-conversion-in-japanese-in-the-search-box/

Handling IME message on Windows ... / General forum / Sublime Text
http://sublimetext.userecho.com/topic/98697-handling-ime-message-on-windows-for-koreanjapanese-and-chinese-user/

Sublime Forum • View topic - Input method support
http://www.sublimetext.com/forum/viewtopic.php?t=7006

Sublime Forum • View topic - input method lost position
http://www.sublimetext.com/forum/viewtopic.php?p=39010

Sublime Forum • View topic - Possible bugs? Windows input methods and ST 219x
http://www.sublimetext.com/forum/viewtopic.php?p=27952

Sublime Forum • View topic - Japanese input doesn't work on OS X, will it ever?
http://www.sublimetext.com/forum/viewtopic.php?p=13569