Does the Jazz Scheme IDE happen to support the infix extension through
some hidden setting that I have been unable to locate?

Thanks,
Cameron

Not at the moment.

When you're writing an IDE you realize that S-expressions are as much
of a good idea to the IDE than to the human :)

In Jedi, every sexpr-based language (Scheme, Gambit, Chicken, PLT,
Jazz, CommonLisp, ...) is fully supported while the others like C,
Python, Lua, ... just have very simple syntax coloring based on an
automata search of keywords.

It would be easy to add that kind of simple syntax coloring to SIX. As
for every other tool like the debugger highlighting the frame
call-site, I'm guessing they will all work seamlessly as Jedi is
really much more of a Gambit debugger than a Jazz debugger as Jedi
relies on source info given by Gambit for everything.

Guillaume