I had the idea of doing this:

(defun byte-recompile-directory (directory &optional arg force 
limit-buffer-saving)

...

If forth argument LIMIT-BUFFER-SAVING is 'directory, only files within
DIRECTORY would be saved.  When LIMIT-BUFFER-SAVING is t no existing buffers
would be checked for modification.


But I found out out that having LIMIT-BUFFER-SAVING with value t like 
this would not work without an accompanying change to 
byte-recompile-file - since byte-recompile-file already checks whether 
there's a buffer for that file and that buffer is modified. So, since I 
don't think that doing changes to byte-recompile-file is the best idea, 
here's my current version.

Also, note that the check in byte-recompile-file actually makes calling 
save-some-buffers somewhat redundant.

-- 
Best Regards,
Nikolay Kudryavtsev