Can JScript.NET be used to script a .NET application?

Question

Since MS appears to have killed Managed JavaScript in the latest DLR for both server-side (ASP.NET Futures) and client-side (Silverlight), has anyone successfully used non-obsolete APIs to allow scripting of their application objects with JScript.NET and/or can explain how to do so? A Mono/JScript solution might also be acceptable, if it is stable and meets the requriements below.

We are interested in upgrading off of a script host which uses the Microsoft JScript engine and ActiveScript APIs to something with more performance and easier extensibility. We have over 16,000 server-side scripts weighing in at over 42MB of source, so rewriting into another scripting language is out of the question.

Our specific requirements are:

• Noteably better performance than the Microsoft JScript (ActiveScript) engine
  • Better runtime performance and/or
  • Retention of pre-parsed or compiled scripts (don't reparse on every run)
  • Lower or equal memory consumption
• Full ECMA-262 ECMAScript compatibility
  • a little porting can be tolerated
• Injection of custom objects into the script namespace
  • .NET objects (not a hard requirement)
  • COM objects or COM objects wrapped in .NET
• Instantiation of COM objects from Script
  • à la "new ActiveXObject(progid)"
  • Low priority given the preceeding
• Include files
  • Pre-loading of "helper scripts" into a script execution context
  • An "include" function or statement (easy to create, given the above)
• Support for code at global-scope
  • Execution of code the global scope
  • Retention of values initialized at global scope
  • Extraction of values from the global scope
  • Injection and replacement of values at the global scope
• Calling of script-defined functions
  • with parameters
  • and with access to the previously initialized global scope
• Source-level debugging
• Commercial or Open Source Support
• Non-obsolete APIs