QIF import and customization

[Anthony W. Juckel]

I posted this message on gnucash-user a few days back, but not many 
people seem to be biting.  One user CC'ed part of my query over to 
devel, but again, no bites.  So, I'm going to try posting my questions 
in full here on devel one more time.

What it all boils down to is this:  I like extensibility.  It is the 
main reason that I choose Emacs as my preferred editor, because (at 
least back when I was choosing editors) emacs' customizability and 
extensibility were far superior to vi.  I like being able to define my 
own lisp functions to get run at any step of the way.

I am looking for that functionality in GnuCash, and am told that it has 
full guile support, but the thing it is lacking (at least from my 
perspective) is proper documentation.  I don't know if I just haven't 
found the appropriate docs or what, but I can't seem to find much, if 
any, information on how to use guile to customize GnuCash.  Is there a 
startup file that gets loaded where I could put some guile procedure 
definitions?  Are there any hooks into the system so I can easily tell 
my newly defined function to run when a specific event happens (say, 
when a transaction is saved)?  Can I override system defined procedures 
with my own (specifically, I'd like to make some modifications to 
gnc:group-find-duplicates to better suit my needs, as right now, it 
still keeps duplicating all checks that I have written)?  Is there any 
definitive documentation on this, anywhere?  Is there even any sparse 
documentation anywhere?  I've seen plenty of docs about how guile 
interacts with the system, but no docs on how the user can use guile to 
modify their own system, without having to edit the global guile 
definitions.

Anthony W. Juckel
Gnucash 1.6.1 (debian package)