If I don't forward, the port is returned as being closed (the only port that returns anything but stealthed). If I forward, the port is returned as being open.
UPDATE: The latest firmware update for the Linksys family of NAT routers has added an adaptive IDENT stealthing feature (though it is not enabled by default). So the Linksys routers will give you the best of both worlds. Bravo Linksys!
We tested the newest dd-wrt firmware about couple days ago on a different router, it also stealths it.
I am required to use identd, that is why I have this port forwarded.
I realize you can't just stealth the port, you have to do an adaptive stealth. ZoneAlarm, linksys and dd-wrt all have managed to do it.