This is a bug showing up in CTP 3 and Win 7 (the german beta download), when running in german locale.
Correct would be, that all Ctrl+ were replaced by Strg+.
The english Win 7 Beta download does not show the bug.
For the curious Strg is an abbrivation of the german word
Steuerung which is a synonym of the german word
Kontrolle, which means just what you can guess without use of a dictionary.
Therefore I spell
Strg as Stupid-Translated-Regular-Garbage, but as this was not invented by Microsoft, I will complain here.
At last some good news for us PowerShell users. To create a custum menue items we have to use the Ctrl- for all locales.
The replacement in display is task of the OS.
Example:
$psISE.CustomMenu.Submenus.Add("run region 5", {dir }, 'strg+D')
will work in any system.
You can vote for the bug at https://connect.microsoft.com/feedback/ViewFeedback.aspx?FeedbackID=411556&SiteID=99
-Bernd