TEMPEL I have followed the beta stage of this app when it had problems dealing with a specific set of routers (DrayTek "Vigor") that Apple's "BackToMyMac" and the file sharing software Transmission could not deal with, either.
This final release fixes these problems, though, which allows me to enter the port mapping for Transmission, saving me from fiddling with the router's web interface directly.
The only things I am missing is the ability to set up a single map entry to map multiple ports, and the ability to edit existing mappings. Both are minor, however, and can be dealt with by a few extra clicks and keystrokes.
(Version 1.0)