Visual Studio Just-In-Time Debugger prompts to select \"Possible Debuggers\", only \"New instance of Microsoft Visual Studio 2010\" is available, I
Have you tried doing so directly from Visual Studio?
http://msdn.microsoft.com/en-us/library/5hs4b7a6.aspx
Scroll to "Enabling or disabling Just-In-Time debugging".
You can disable it only for Script if that's what you want.
Let me know how this works for you.