[plt-scheme] Tag search in PLT?

Hello schemers,

This is what keeps me busy all of the time whenever I take a look at a source
code not written by me: I open a source code file in PLT and see a call of a
function.  If I right-click on it, there's only the choice for searching the
HelpDesk, but not something like "jump to definition".  This one is easy, if the
definition is within the same file, but if it's spread along several files, I am
having troubles.  It's not enough or convenient just to browse the dependency
tree of the modules, since I still don't know where a function is defined.  Also
the search in file function is not perfect for this.

Is there anything available that does exactly what I want (like ctags) or will
there be a version of DrScheme with right-click "jump to definition"?

- Chris