Desired Features in FreeMarker

I've been doing quite a bit of prototyping with Spring MVC and Struts 2 with
both JSP and FreeMarker in the last few months. I'm trying to migrate a
proprietary servlet-based framework with a proprietary JSP compiler to
something that's open source. There's a couple of important features that
the proprietary view framework has:

1. It's expression language allows methods to be called with arguments.
2. Templates can be loaded from a JAR on a remote server.
3. XML in variables is escaped by default.

For #1, I've found this to be impossible with JSP EL or JSTL. I've created
JSP functions that allow argument passing, but they don't allow overloading
of functions. FreeMarker solves #1.

For #2, JSPs again fail because the templates have to be on the file system
or in a WAR. FreeMarker solves this problem as well.

For #3, neither JSP or FreeMarker solve this problem. I realize it can be
fixed in FreeMarker by hacking the code - I've done the same with Tomcat and
solved it for JSP as well.

So based on the requirements in this project, FreeMarker is the clear
winner. However, there's a couple of questions I have.

1. When doing the JSP-based prototype with Struts 2, I was able to use JSP
2.0 tag files to develop a <foo:body> tag that allows content to be added
around the body of the page. Does FreeMarker offer something similar, or is
it something like SiteMesh the only solution?

2. Is it possible to add static imports/methods to a context so
"url(foo).q(bar)" can be used instead of referring to the object that
contains the methods - "urlBuilder.url(foo).q(bar)"?

3. Is it possible to change how HTML is parsed so you can override or
customize the    tag? The current compiler does this and it allows more
fine-grained control over template processing without requiring new macros
to be called. 

Thanks for any information you can provide.

Matt
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