Windows – Hotkey to switch input language in Windows 7

You were very close to the solution of your problem ;)

Control Panel -> Regional and Language Options -> Languages tab -> Details...

There, you can edit the hotkeys to change input languages. If you press the Change Key Sequence... button, you will be able to change (disable) the hotkey which switches keyboard layouts (that Ctrl+Shift combination you mentioned).

I solved this problem using AutoHotKey.

Set up 3 languages, a hotkey for switching between them and another hotkey for switching to the language you want to skip. I had English, Russian and Japanese and wanted to skip Japanese so I assigned Ctrl+Shift+0 to switch to JP.

I already had an AutoHotKey script that allowed me to switch between all the 3 languages using Caps. It looked like this:

CapsLock::Send, {Alt Down}{Shift Down}{Shift Up}{Alt Up}

The idea is to switch the language automatically once you switched to the language you want to skip. It's 0x0411 for Japanese. Paste yours in the if clause in the script below, save it and run it.

Here is the list of language ids, find yours in the first column.

The script only works for switching between languages using CapsLock but you can adapt it to Alt+Shift switch. Probably just by replacing "CapsLock" with "{Alt Down}{Shift Down}{Shift Up}{Alt Up}".

CapsLock::
Send, {Alt Down}{Shift Down}{Shift Up}{Alt Up}

if !LangID := GetKeyboardLanguage(WinActive("A"))
{
    MsgBox, % "GetKeyboardLayout function failed " ErrorLevel
    return
}

if (LangID = 0x0411)
    Send, {Alt Down}{Shift Down}{Shift Up}{Alt Up}
return

GetKeyboardLanguage(_hWnd=0)
{
    if !_hWnd
        ThreadId=0
    else
        if !ThreadId := DllCall("user32.dll\GetWindowThreadProcessId", "Ptr", _hWnd, "UInt", 0, "UInt")
            return false

    if !KBLayout := DllCall("user32.dll\GetKeyboardLayout", "UInt", ThreadId, "UInt")
        return false

    return KBLayout & 0xFFFF
}