Dynamically compute org-agenda-files

["Chris Leyon" <cleyon@gmail.com>]

I currently use Planner for organizing my work activities & notes and
am contemplating converting to Org-mode, but there is a capability
that Planner has which Org doesn't (AFAIK) that is holding me back.
(No flamewar please.)

I have hundreds of Planner files, one for each of my customers, with
WikiNames.  When I add a new customer, I just create a new file from a
template and put it in my `muse-project-alist' directory and Planner
automatically sees the file, its tasks, it is automatically
searchable, etc.

But in org-mode, it is not feasible to maintain hundreds of separate
files.  I prefer having separate files for each customer so I'd like
to keep that paradigm.

What I would like is something along the lines of an
org-agenda-files-directory variable, which would be a directory (or a
list of dirs) that would be automatically searched for *.org files.

I'm no lisp hacker, but it appears that Org uses the value of the
variable `org-agenda-files'.  What if this could be changed to a
function along the lines of:

(defun org-agenda-files ()
  (directory-files org-agenda-files-directory t "*\\.org"))

or something similar?