public and shared folder identifiers are not displayed as directories

Hello,
I'm using uw-imapd 2007b on my mail server. For quite a while
I'm now using public/shared folders to share information between
different users or provide a central spam mailbox.

This is e.g. my folder/mailbox structure:

#public         -> folder
   + Spam-Mail  -> mailbox

Sometimes I'm erroneously selecting the #public (or #shared)
folder in my Thunderbird client which causes the following
error message:

  Can't open mailbox #public/#public: no such mailbox

I raised a bug request for TB but based on the following
discussion of the developers this problem seems to be a
uw-imapd problem because the server doesn't return a
\NoSelect if such a folder is selected.

Here you can find further debug information and the discussion
of the problem:

https://bugzilla.mozilla.org/show_bug.cgi?id=517054

Now I wonder if this is really a problem of uw-imapd and
if so, how it can be solved?

Thanks
Juergen