Aaron B,
You're correct in that nothing needs to be done on the infrastructure AP side. When one of these APs is configured to operate in client-bridge mode, they are then behaving just like a wireless client device (granted, a much more expensive and better performing one...but the same behaviors). Just like any client, you tell it the SSID, you give it the authentication credentials, and it connects. Done.
As for as the channel setup, since the client-bridge is operating like a regular client, you simply want it to scan all the channels, just like a regular laptop/phone client, right? You *could* statically assign a single channel or subset of channels...but just know that you are then confining the client-bridge AP to only be able to discover other APs that operate on those same channels.
Aaron W,
Regarding the configuration in CLI - In the early days when the client-bridge feature was introduced, all of the configuration work was done in the CLI. Since that time though, an AP can be setup completely from the GUI. (diagnostics/queries are still run from the CLI though, for troubleshooting).
You say that you're GUI doesn't have these options....what version of WiNG is running on the AP? If it's older, that would explain it. There's also a history where only certain APs supported the client-bridge option based on the version of WiNG (APs that previously didn't officially support client-bridge mode were later supported after newer versions of WiNG were released).
FYI: Client-bridge supported started in WiNG-5.8.5. WiNG-5.9.3.0 is the current release. There have been various fixes for different client-bridge issues since the initial release.