Logged In: YES 
user_id=139309

And if the listdir performance is the only killer, the "recursive site" 
protocol could be changed slightly -- it could depend on the existence of 
some file (e.g. "python-site"), so the os.listdir() turns into a false 
os.path.exists() in the general case (where it is not intended to be added 
as another site directory).

Alternatively, some token in the .pth file could say "this points to 
another site dir".  Currently that (undocumented) token actually exists, 
but it looks like this:
import site; site.addsitedir("....")