RScheme is an object-oriented, extended Scheme implementation with a compiler that targets C or (RScheme's own) bytecodes. It has features expected from a modern language: an object system, reflection, modules, namespaces, safe macros, threads, a system call interface (including sockets), separate compilation, and persistence, as well as the formal basis and power of the Scheme programming language. RScheme also features a powerful, elegant foreign code interface.
RScheme's license isn't exactly LGPL, but very close. Please read COPYING. I categorized it as LGPL because it seemed like the closest match [fm] provided; I do not mean to purposely deceive regarding the terms of the license.
Some Suggestions: Precursors & Parentheses
I'm coming to this discussion late, sorry if I restate someone else's opinions.
I'd like to point out that there are a lot of other systems with similar goals, some very successful. Take webmin (www.webmin.com), for example. It has a wide range of plugins which add to the list of programs that webmin can configure. Its UI is a webpage, served over https by an internal server. HTML is nice for developing the kinds of UIs needed by this program (forms), so new forms are developed quickly.
Where webmin is practical, the next example is theoretically nice: Emacs M-x customize. Emacs customization groups provide a general, form-based way to configure Emacs extensions. The documentation, including samples, is right there in front of you. I'd say that if a new Emacs user could figure out how to get into the customization groups, there'd be no problem configuring the favorite extensions. This system has some things that you aren't assuming, however, like some standard ways in which all programs read in their configuration (through emacs-lisp variables).
I really respect this project, I think it's a great idea. Check out these systems so that you could possibly incorporate their good points.
btw, I saw in the author info that you were at the Honolulu ICPC? I think I remember seeing Messiah on the roster. I competed with the team from UCF there.