popa3d and virtual domains

Hi,

As far as I can determine, popa3d (patched with the vname patch) will
support local virtual domains (i.e.  domain:<path>).  Is there a patch
out there that can support external paths?
(i.e. domain:<server>:<port>)?   So instead of popa3d retrieving
mail from a local virtual server,  it goes for another pop server
(by relaying commands coming from and contents going to the
client).

Any clarifications appreciated.

Ed