logoUrl property on account object

I have been getting some requirements questions recently related to what our options are for customizing the look/feel of the signing ceremony. I've found this documentation - http://docs.esignlive.com/content/c_integrator_s_guide/sdk/k_customization/customizing_the_signing_cermony.htm - which seems to hold some promise as far as fulfilling some of the requirements questions, but I also noticed something when poking around on the "account" object itself in the API. I did a GET to this resource for my sandbox: https://sandbox.esignlive.com/api/account In the results, I noticed there is a property called "logoUrl" whose value is set to an empty string. My questions are: (1) What would setting this value do (if anything) in terms of signing ceremony? (2) How would one go about setting this value? I don't see any options to do so in the UI and attempting to do a PUT against the account resource returns me a "405 Method Not Allowed" response. Thank you! Nick