Expression Evaluation in JSPX Debugging Follow

I've gotten IDEA 3448 to stop in my test.jspx file, after setting up my web module correctly. I'm using Tomcat 5.5.9.

The next question is, what is the deal with expression evaluation? The only thing available to inspect is the Frame variables, and if you drill down enough you can get to the request scope attributes. But I would have rather expected to use Alt-F8 as usual to evaluate the likes of 'requestScope.myVar' or any other EL expression. I really cannot get anything to evaluate in the Expression Evaluator.

Am I doing something wrong, or is this just new and limited support for JSPX? Thanks.