Great.  Attached is a loading.texi patch that just add to the
description of list-load-path-shadows that it will not report
.dir-locals.el files.  Do you think there should be a @deffn entry for 
list-load-path-dir-locals-shadows as well?

Also attached is a shadow.el patch with the following changes: 

1. Some more doc string text. 
2. list-load-path-dir-locals-shadows uses the same button making code as
list-load-path-shadows. 
3. Inherit the major mode from special-mode instead of fundamental-mode
to get quit on ?q etc. 
4. Also bind forward-button to tab in this mode.  And backward-button to
backtab. 
5. It will not bail out on an invalid directory in load-path any more (i
happened to have some invalid directories in load-path while testing
this :) ). 

Regards,

/Johan