There are no "scripting" languages as such that are native to Crystal. There is an SDK that you have to use. VB uses the COM SDK which I believe has been deprecated and will not be available for future versions (I'm not sure whether it's available for Crystal 2011).
There are Java and .NET SDK's available. So, you could possibly use VBA from within an Office application. I don't know whether JavaScript will connect to the SDK or not.
-Dell