やりたいこと

Mac の操作に慣れているので、Windows でも「半角英数 <-> ローマ字」の変換をスペースキーの両側のキーで切り替わるようにしたい。

既存の記事じゃだめなのか

同じようなことを解説している記事は他にもあったが、自環境で突然暴走(?)したりした。
ので、現状いい感じに動いている自環境での設定の最新版をここにおいておく。

追記

自環境で突然暴走(?)したりした

暴走した原因がわかった。
何かの拍子に IME が Google日本語入力 から Microsoft IME 等の他の IME に切り替わっていることがあり、その場合に IME が暴走するみたい。
落ち着いて IME を Google日本語入力に戻してあげることで、暴走はおさまる。

設定

使用する IME

Gooogle 日本語入力

プロパティ - 一般

キー設定

Henkan, Muhenkan あたりをいじった。

keymap.txt

下記のテキストを keymap.txt として保存して、インポートすることで、状態を再現できる。

status	key	command
Conversion	Up	ConvertPrev
Composition	Tab	PredictAndConvert
Conversion	Tab	PredictAndConvert
Composition	Space	Convert
Conversion	Space	ConvertNext
Precomposition	Space	InsertSpace
Conversion	Shift Up	ConvertPrevPage
Conversion	Shift Tab	ConvertPrev
Composition	Shift Space	Convert
Conversion	Shift Space	ConvertPrev
Precomposition	Shift Space	InsertAlternateSpace
Composition	Shift Right	MoveCursorRight
Conversion	Shift Right	SegmentWidthExpand
Composition	Shift Muhenkan	ConvertToFullAlphanumeric
Conversion	Shift Muhenkan	ConvertToFullAlphanumeric
Precomposition	Shift Muhenkan	ToggleAlphanumericMode
Composition	Shift Left	MoveCursorLeft
Conversion	Shift Left	SegmentWidthShrink
Conversion	Shift Henkan	ConvertPrev
Composition	Shift ESC	Cancel
Conversion	Shift ESC	Cancel
Suggestion	Shift Enter	CommitFirstSuggestion
Conversion	Shift Down	ConvertNextPage
Composition	Shift Backspace	Backspace
Conversion	Shift Backspace	Cancel
Composition	Right	MoveCursorRight
Conversion	Right	SegmentFocusRight
Conversion	PageUp	ConvertPrevPage
Conversion	PageDown	ConvertNextPage
Composition	Muhenkan	IMEOff
Conversion	Muhenkan	IMEOff
Precomposition	Muhenkan	IMEOff
Composition	Left	MoveCursorLeft
Conversion	Left	SegmentFocusLeft
Composition	Katakana	InputModeFullKatakana
Conversion	Katakana	InputModeFullKatakana
DirectInput	Katakana	IMEOn
Precomposition	Katakana	InputModeFullKatakana
Composition	Home	MoveCursorToBeginning
Conversion	Home	SegmentFocusFirst
Composition	Hiragana	InputModeHiragana
Conversion	Hiragana	InputModeHiragana
DirectInput	Hiragana	IMEOn
Precomposition	Hiragana	InputModeHiragana
Composition	Henkan	InputModeHiragana
Conversion	Henkan	InputModeHiragana
DirectInput	Henkan	InputModeHiragana
Precomposition	Henkan	InputModeHiragana
Composition	Hankaku/Zenkaku	IMEOff
Conversion	Hankaku/Zenkaku	IMEOff
DirectInput	Hankaku/Zenkaku	IMEOn
Precomposition	Hankaku/Zenkaku	IMEOff
Composition	F9	ConvertToFullAlphanumeric
Conversion	F9	ConvertToFullAlphanumeric
Composition	F8	ConvertToHalfWidth
Conversion	F8	ConvertToHalfWidth
Composition	F7	ConvertToFullKatakana
Conversion	F7	ConvertToFullKatakana
Composition	F6	ConvertToHiragana
Conversion	F6	ConvertToHiragana
Composition	F2	ConvertWithoutHistory
DirectInput	F13	IMEOn
Composition	F10	ConvertToHalfAlphanumeric
Conversion	F10	ConvertToHalfAlphanumeric
Composition	ESC	Cancel
Conversion	ESC	Cancel
Composition	Enter	Commit
Conversion	Enter	Commit
Composition	End	MoveCursorToEnd
Conversion	End	SegmentFocusLast
Composition	Eisu	ToggleAlphanumericMode
Conversion	Eisu	ToggleAlphanumericMode
DirectInput	Eisu	IMEOn
Precomposition	Eisu	ToggleAlphanumericMode
Composition	Down	MoveCursorToEnd
Conversion	Down	ConvertNext
Suggestion	Down	PredictAndConvert
Composition	Delete	Delete
Conversion	Delete	Cancel
Composition	Ctrl z	Cancel
Conversion	Ctrl z	Cancel
Composition	Ctrl x	MoveCursorToEnd
Conversion	Ctrl x	ConvertNext
Composition	Ctrl Up	MoveCursorToBeginning
Conversion	Ctrl Up	ConvertPrev
Composition	Ctrl u	ConvertToHiragana
Conversion	Ctrl u	ConvertToHiragana
Composition	Ctrl t	ConvertToHalfAlphanumeric
Conversion	Ctrl t	ConvertToHalfAlphanumeric
Composition	Ctrl Space	InsertHalfSpace
Conversion	Ctrl Space	InsertHalfSpace
Composition	Ctrl Shift Space	InsertFullSpace
Conversion	Ctrl Shift Space	InsertFullSpace
Precomposition	Ctrl Shift Space	InsertFullSpace
Composition	Ctrl s	MoveCursorLeft
Conversion	Ctrl s	SegmentFocusLeft
Composition	Ctrl Right	MoveCursorToEnd
Conversion	Ctrl Right	SegmentFocusLast
Composition	Ctrl p	ConvertToFullAlphanumeric
Conversion	Ctrl p	ConvertToFullAlphanumeric
Composition	Ctrl o	ConvertToHalfWidth
Conversion	Ctrl o	ConvertToHalfWidth
Composition	Ctrl n	MoveCursorToEnd
Conversion	Ctrl n	CommitOnlyFirstSegment
Composition	Ctrl m	Commit
Conversion	Ctrl m	Commit
Composition	Ctrl Left	MoveCursorToBeginning
Conversion	Ctrl Left	SegmentFocusFirst
Composition	Ctrl l	MoveCursorRight
Conversion	Ctrl l	SegmentWidthExpand
Composition	Ctrl k	MoveCursorLeft
Conversion	Ctrl k	SegmentWidthShrink
Composition	Ctrl i	ConvertToFullKatakana
Conversion	Ctrl i	ConvertToFullKatakana
Composition	Ctrl h	Backspace
Conversion	Ctrl h	Cancel
Composition	Ctrl g	Delete
Conversion	Ctrl g	Cancel
Composition	Ctrl f	MoveCursorToEnd
Conversion	Ctrl f	SegmentFocusLast
Composition	Ctrl Enter	Commit
Conversion	Ctrl Enter	Commit
Composition	Ctrl e	MoveCursorToBeginning
Conversion	Ctrl e	ConvertPrev
Composition	Ctrl Down	MoveCursorToEnd
Conversion	Ctrl Down	CommitOnlyFirstSegment
Prediction	Ctrl Delete	DeleteSelectedCandidate
Composition	Ctrl d	MoveCursorRight
Conversion	Ctrl d	SegmentFocusRight
Composition	Ctrl Backspace	Backspace
Conversion	Ctrl Backspace	Cancel
Precomposition	Ctrl Backspace	Undo
Composition	Ctrl a	MoveCursorToBeginning
Conversion	Ctrl a	SegmentFocusFirst
Composition	Backspace	Backspace
Conversion	Backspace	Cancel
Precomposition	Backspace	Revert
Composition	ASCII	InsertCharacter
Composition	Kanji	IMEOff
Composition	OFF	IMEOff
Composition	ON	IMEOn
Conversion	Kanji	IMEOff
Conversion	OFF	IMEOff
Conversion	ON	IMEOn
DirectInput	Kanji	IMEOn
DirectInput	ON	IMEOn
Precomposition	ASCII	InsertCharacter
Precomposition	Kanji	IMEOff
Precomposition	OFF	IMEOff
Precomposition	ON	IMEOn

おまけ

CapsLock は Shift + CapsLock で解除できる。
(これでしばらく混乱してた)