Thank you both. I have now tried setting the WAP up as first as AP Mode = wireless client/repeater and then as AP Mode = Wireless WDS repeater, with each scenario yielding no positive results.
In the first scenario, using AP Mode = wireless client/repeater, I am unable to access either the 4400 or the 4410 wirelessly. Specifically, I never acquire an IP address from the network. If I am plugged into the 4400 via ethernet, access is just fine. My network utility (Thinkvantage Access Connections) lists entries for the MAC address of each piece of hardware and when I attempt to connect to either via wireless, it never finishes securing the IP.
In the second scenario, using AP Mode = Wireless WDS repeater, I am still able to connect to the 4400 wirelessly (and out to the web), but not through the 4410, which doesn help me fix the original deadspot issue. For clarity, I can see both via my network utility, and I can connect to the 4410, but I am then unable to connect out.
Not sure if its relevant, but in both cases, the 4400 is set via the WDS tab of the admin to "Allow wireless signal to be repeated by a repeater" and I have tried both automatic and manual connection modes. Following is the language from the same tab that I refered to in my original post which caused me to believe that a second 4400 dropped into the deadzone may be the best response, "Note: The WDS feature allows WRVS4400N to connect with up to 3 wireless repeaters that can be either WRVS4400N or WAP200." However, I don know if the second 4400 would work wirelessly or need to be wired to the original.
I have spent quite a few hours changing settings and taking things down and back up, and any continued suggestions would be appreciated.